[0e2e23] | 1 | /*****************************************************************************\ |
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| 2 | * Computer Algebra System SINGULAR |
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| 3 | \*****************************************************************************/ |
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[c2aeb9] | 4 | /** @file facMul.cc |
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[0e2e23] | 5 | * |
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| 6 | * This file implements functions for fast multiplication and division with |
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| 7 | * remainder |
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| 8 | * |
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| 9 | * @author Martin Lee |
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| 10 | * |
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| 11 | **/ |
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| 12 | /*****************************************************************************/ |
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| 13 | |
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| 14 | #include "debug.h" |
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| 15 | |
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| 16 | #include "canonicalform.h" |
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| 17 | #include "facMul.h" |
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| 18 | #include "algext.h" |
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[81d96c] | 19 | #include "cf_util.h" |
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[0e2e23] | 20 | #include "templates/ftmpl_functions.h" |
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| 21 | |
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| 22 | #ifdef HAVE_NTL |
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| 23 | #include <NTL/lzz_pEX.h> |
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| 24 | #include "NTLconvert.h" |
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| 25 | |
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| 26 | #ifdef HAVE_FLINT |
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| 27 | #include "FLINTconvert.h" |
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| 28 | #endif |
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| 29 | |
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[81d96c] | 30 | // univariate polys |
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| 31 | |
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[0e2e23] | 32 | #ifdef HAVE_FLINT |
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| 33 | void kronSub (fmpz_poly_t result, const CanonicalForm& A, int d) |
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| 34 | { |
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| 35 | int degAy= degree (A); |
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| 36 | fmpz_poly_init2 (result, d*(degAy + 1)); |
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| 37 | _fmpz_poly_set_length (result, d*(degAy + 1)); |
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| 38 | CFIterator j; |
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| 39 | for (CFIterator i= A; i.hasTerms(); i++) |
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| 40 | { |
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| 41 | if (i.coeff().inBaseDomain()) |
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| 42 | convertCF2Fmpz (fmpz_poly_get_coeff_ptr (result, i.exp()*d), i.coeff()); |
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| 43 | else |
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| 44 | for (j= i.coeff(); j.hasTerms(); j++) |
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| 45 | convertCF2Fmpz (fmpz_poly_get_coeff_ptr (result, i.exp()*d+j.exp()), |
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| 46 | j.coeff()); |
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| 47 | } |
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| 48 | _fmpz_poly_normalise(result); |
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| 49 | } |
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| 50 | |
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| 51 | |
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| 52 | CanonicalForm |
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[81d96c] | 53 | reverseSubstQa (const fmpz_poly_t F, int d, const Variable& alpha, |
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| 54 | const CanonicalForm& den) |
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[0e2e23] | 55 | { |
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| 56 | Variable x= Variable (1); |
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| 57 | |
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| 58 | CanonicalForm result= 0; |
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| 59 | int i= 0; |
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| 60 | int degf= fmpz_poly_degree (F); |
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| 61 | int k= 0; |
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| 62 | int degfSubK; |
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| 63 | int repLength, j; |
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[b78a13] | 64 | CanonicalForm coeff, ff; |
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[0e2e23] | 65 | fmpz* tmp; |
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| 66 | while (degf >= k) |
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| 67 | { |
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| 68 | coeff= 0; |
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| 69 | degfSubK= degf - k; |
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| 70 | if (degfSubK >= d) |
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| 71 | repLength= d; |
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| 72 | else |
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| 73 | repLength= degfSubK + 1; |
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| 74 | |
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| 75 | for (j= 0; j < repLength; j++) |
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| 76 | { |
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| 77 | tmp= fmpz_poly_get_coeff_ptr (F, j+k); |
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| 78 | if (!fmpz_is_zero (tmp)) |
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| 79 | { |
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[b78a13] | 80 | ff= convertFmpz2CF (tmp); |
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| 81 | coeff += ff*power (alpha, j); //TODO faster reduction mod alpha |
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[0e2e23] | 82 | } |
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| 83 | } |
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| 84 | result += coeff*power (x, i); |
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| 85 | i++; |
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| 86 | k= d*i; |
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| 87 | } |
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[b78a13] | 88 | result /= den; |
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[0e2e23] | 89 | return result; |
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| 90 | } |
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| 91 | |
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| 92 | CanonicalForm |
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| 93 | mulFLINTQa (const CanonicalForm& F, const CanonicalForm& G, |
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| 94 | const Variable& alpha) |
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| 95 | { |
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| 96 | CanonicalForm A= F; |
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| 97 | CanonicalForm B= G; |
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| 98 | |
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| 99 | CanonicalForm denA= bCommonDen (A); |
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| 100 | CanonicalForm denB= bCommonDen (B); |
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| 101 | |
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| 102 | A *= denA; |
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| 103 | B *= denB; |
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| 104 | int degAa= degree (A, alpha); |
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| 105 | int degBa= degree (B, alpha); |
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| 106 | int d= degAa + 1 + degBa; |
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| 107 | |
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| 108 | fmpz_poly_t FLINTA,FLINTB; |
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| 109 | fmpz_poly_init (FLINTA); |
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| 110 | fmpz_poly_init (FLINTB); |
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| 111 | kronSub (FLINTA, A, d); |
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| 112 | kronSub (FLINTB, B, d); |
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| 113 | |
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| 114 | fmpz_poly_mul (FLINTA, FLINTA, FLINTB); |
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| 115 | |
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| 116 | denA *= denB; |
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[81d96c] | 117 | A= reverseSubstQa (FLINTA, d, alpha, denA); |
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[0e2e23] | 118 | |
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| 119 | fmpz_poly_clear (FLINTA); |
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| 120 | fmpz_poly_clear (FLINTB); |
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| 121 | return A; |
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| 122 | } |
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| 123 | |
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| 124 | CanonicalForm |
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| 125 | mulFLINTQ (const CanonicalForm& F, const CanonicalForm& G) |
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| 126 | { |
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| 127 | CanonicalForm A= F; |
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| 128 | CanonicalForm B= G; |
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| 129 | |
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| 130 | CanonicalForm denA= bCommonDen (A); |
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| 131 | CanonicalForm denB= bCommonDen (B); |
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| 132 | |
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| 133 | A *= denA; |
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| 134 | B *= denB; |
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| 135 | fmpz_poly_t FLINTA,FLINTB; |
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| 136 | convertFacCF2Fmpz_poly_t (FLINTA, A); |
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| 137 | convertFacCF2Fmpz_poly_t (FLINTB, B); |
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| 138 | fmpz_poly_mul (FLINTA, FLINTA, FLINTB); |
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| 139 | denA *= denB; |
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| 140 | A= convertFmpz_poly_t2FacCF (FLINTA, F.mvar()); |
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| 141 | A /= denA; |
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| 142 | fmpz_poly_clear (FLINTA); |
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| 143 | fmpz_poly_clear (FLINTB); |
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| 144 | |
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| 145 | return A; |
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| 146 | } |
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| 147 | |
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| 148 | /*CanonicalForm |
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| 149 | mulFLINTQ2 (const CanonicalForm& F, const CanonicalForm& G) |
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| 150 | { |
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| 151 | CanonicalForm A= F; |
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| 152 | CanonicalForm B= G; |
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| 153 | |
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| 154 | fmpq_poly_t FLINTA,FLINTB; |
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| 155 | convertFacCF2Fmpq_poly_t (FLINTA, A); |
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| 156 | convertFacCF2Fmpq_poly_t (FLINTB, B); |
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| 157 | |
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| 158 | fmpq_poly_mul (FLINTA, FLINTA, FLINTB); |
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| 159 | A= convertFmpq_poly_t2FacCF (FLINTA, F.mvar()); |
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| 160 | fmpq_poly_clear (FLINTA); |
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| 161 | fmpq_poly_clear (FLINTB); |
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| 162 | return A; |
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| 163 | }*/ |
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| 164 | |
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| 165 | CanonicalForm |
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| 166 | divFLINTQ (const CanonicalForm& F, const CanonicalForm& G) |
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| 167 | { |
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| 168 | CanonicalForm A= F; |
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| 169 | CanonicalForm B= G; |
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| 170 | |
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| 171 | fmpq_poly_t FLINTA,FLINTB; |
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| 172 | convertFacCF2Fmpq_poly_t (FLINTA, A); |
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| 173 | convertFacCF2Fmpq_poly_t (FLINTB, B); |
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| 174 | |
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| 175 | fmpq_poly_div (FLINTA, FLINTA, FLINTB); |
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| 176 | A= convertFmpq_poly_t2FacCF (FLINTA, F.mvar()); |
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| 177 | |
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| 178 | fmpq_poly_clear (FLINTA); |
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| 179 | fmpq_poly_clear (FLINTB); |
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| 180 | return A; |
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| 181 | } |
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| 182 | |
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| 183 | CanonicalForm |
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| 184 | modFLINTQ (const CanonicalForm& F, const CanonicalForm& G) |
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| 185 | { |
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| 186 | CanonicalForm A= F; |
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| 187 | CanonicalForm B= G; |
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| 188 | |
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| 189 | fmpq_poly_t FLINTA,FLINTB; |
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| 190 | convertFacCF2Fmpq_poly_t (FLINTA, A); |
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| 191 | convertFacCF2Fmpq_poly_t (FLINTB, B); |
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| 192 | |
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| 193 | fmpq_poly_rem (FLINTA, FLINTA, FLINTB); |
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| 194 | A= convertFmpq_poly_t2FacCF (FLINTA, F.mvar()); |
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| 195 | |
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| 196 | fmpq_poly_clear (FLINTA); |
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| 197 | fmpq_poly_clear (FLINTB); |
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| 198 | return A; |
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| 199 | } |
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| 200 | |
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| 201 | CanonicalForm |
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| 202 | mulFLINTQaTrunc (const CanonicalForm& F, const CanonicalForm& G, |
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| 203 | const Variable& alpha, int m) |
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| 204 | { |
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| 205 | CanonicalForm A= F; |
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| 206 | CanonicalForm B= G; |
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| 207 | |
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| 208 | CanonicalForm denA= bCommonDen (A); |
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| 209 | CanonicalForm denB= bCommonDen (B); |
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| 210 | |
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| 211 | A *= denA; |
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| 212 | B *= denB; |
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| 213 | |
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| 214 | int degAa= degree (A, alpha); |
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| 215 | int degBa= degree (B, alpha); |
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| 216 | int d= degAa + 1 + degBa; |
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| 217 | |
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| 218 | fmpz_poly_t FLINTA,FLINTB; |
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| 219 | fmpz_poly_init (FLINTA); |
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| 220 | fmpz_poly_init (FLINTB); |
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| 221 | kronSub (FLINTA, A, d); |
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| 222 | kronSub (FLINTB, B, d); |
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| 223 | |
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| 224 | int k= d*m; |
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| 225 | fmpz_poly_mullow (FLINTA, FLINTA, FLINTB, k); |
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| 226 | |
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| 227 | denA *= denB; |
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[81d96c] | 228 | A= reverseSubstQa (FLINTA, d, alpha, denA); |
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[0e2e23] | 229 | fmpz_poly_clear (FLINTA); |
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| 230 | fmpz_poly_clear (FLINTB); |
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| 231 | return A; |
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| 232 | } |
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| 233 | |
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| 234 | CanonicalForm |
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| 235 | mulFLINTQTrunc (const CanonicalForm& F, const CanonicalForm& G, int m) |
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| 236 | { |
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| 237 | if (F.inCoeffDomain() || G.inCoeffDomain()) |
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| 238 | return mod (F*G, power (Variable (1), m)); |
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| 239 | Variable alpha; |
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| 240 | if (hasFirstAlgVar (F, alpha) || hasFirstAlgVar (G, alpha)) |
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| 241 | return mulFLINTQaTrunc (F, G, alpha, m); |
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| 242 | |
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| 243 | CanonicalForm A= F; |
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| 244 | CanonicalForm B= G; |
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| 245 | |
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| 246 | CanonicalForm denA= bCommonDen (A); |
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| 247 | CanonicalForm denB= bCommonDen (B); |
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| 248 | |
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| 249 | A *= denA; |
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| 250 | B *= denB; |
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| 251 | fmpz_poly_t FLINTA,FLINTB; |
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| 252 | convertFacCF2Fmpz_poly_t (FLINTA, A); |
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| 253 | convertFacCF2Fmpz_poly_t (FLINTB, B); |
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| 254 | fmpz_poly_mullow (FLINTA, FLINTA, FLINTB, m); |
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| 255 | denA *= denB; |
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| 256 | A= convertFmpz_poly_t2FacCF (FLINTA, F.mvar()); |
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| 257 | A /= denA; |
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| 258 | fmpz_poly_clear (FLINTA); |
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| 259 | fmpz_poly_clear (FLINTB); |
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| 260 | |
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| 261 | return A; |
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| 262 | } |
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| 263 | |
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| 264 | CanonicalForm uniReverse (const CanonicalForm& F, int d) |
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| 265 | { |
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| 266 | if (d == 0) |
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| 267 | return F; |
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| 268 | if (F.inCoeffDomain()) |
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| 269 | return F*power (Variable (1),d); |
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| 270 | Variable x= Variable (1); |
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| 271 | CanonicalForm result= 0; |
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| 272 | CFIterator i= F; |
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| 273 | while (d - i.exp() < 0) |
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| 274 | i++; |
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| 275 | |
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| 276 | for (; i.hasTerms() && (d - i.exp() >= 0); i++) |
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| 277 | result += i.coeff()*power (x, d - i.exp()); |
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| 278 | return result; |
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| 279 | } |
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| 280 | |
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| 281 | CanonicalForm |
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| 282 | newtonInverse (const CanonicalForm& F, const int n) |
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| 283 | { |
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| 284 | int l= ilog2(n); |
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| 285 | |
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| 286 | CanonicalForm g= F [0]; |
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| 287 | |
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| 288 | ASSERT (!g.isZero(), "expected a unit"); |
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| 289 | |
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| 290 | if (!g.isOne()) |
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| 291 | g = 1/g; |
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| 292 | Variable x= Variable (1); |
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| 293 | CanonicalForm result; |
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| 294 | int exp= 0; |
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| 295 | if (n & 1) |
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| 296 | { |
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| 297 | result= g; |
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| 298 | exp= 1; |
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| 299 | } |
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| 300 | CanonicalForm h; |
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| 301 | |
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| 302 | for (int i= 1; i <= l; i++) |
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| 303 | { |
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| 304 | h= mulNTL (g, mod (F, power (x, (1 << i)))); |
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| 305 | h= mod (h, power (x, (1 << i)) - 1); |
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| 306 | h= div (h, power (x, (1 << (i - 1)))); |
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| 307 | g -= power (x, (1 << (i - 1)))* |
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| 308 | mulFLINTQTrunc (g, h, 1 << (i-1)); |
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| 309 | |
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| 310 | if (n & (1 << i)) |
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| 311 | { |
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| 312 | if (exp) |
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| 313 | { |
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| 314 | h= mulNTL (result, mod (F, power (x, exp + (1 << i)))); |
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| 315 | h= mod (h, power (x, exp + (1 << i)) - 1); |
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| 316 | h= div (h, power (x, exp)); |
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| 317 | result -= power(x, exp)*mulFLINTQTrunc (g, h, 1 << i); |
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| 318 | exp += (1 << i); |
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| 319 | } |
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| 320 | else |
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| 321 | { |
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| 322 | exp= (1 << i); |
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| 323 | result= g; |
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| 324 | } |
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| 325 | } |
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| 326 | } |
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| 327 | |
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| 328 | return result; |
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| 329 | } |
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| 330 | |
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| 331 | void |
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| 332 | newtonDivrem (const CanonicalForm& F, const CanonicalForm& G, CanonicalForm& Q, |
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| 333 | CanonicalForm& R) |
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| 334 | { |
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| 335 | CanonicalForm A= F; |
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| 336 | CanonicalForm B= G; |
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| 337 | Variable x= Variable (1); |
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| 338 | int degA= degree (A, x); |
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| 339 | int degB= degree (B, x); |
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| 340 | int m= degA - degB; |
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| 341 | |
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| 342 | if (m < 0) |
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| 343 | { |
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| 344 | R= A; |
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| 345 | Q= 0; |
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| 346 | return; |
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| 347 | } |
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| 348 | |
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| 349 | if (degB <= 1) |
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| 350 | divrem (A, B, Q, R); |
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| 351 | else |
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| 352 | { |
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| 353 | R= uniReverse (A, degA); |
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| 354 | |
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| 355 | CanonicalForm revB= uniReverse (B, degB); |
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| 356 | CanonicalForm buf= revB; |
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| 357 | revB= newtonInverse (revB, m + 1); |
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| 358 | Q= mulFLINTQTrunc (R, revB, m + 1); |
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| 359 | Q= uniReverse (Q, m); |
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| 360 | |
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| 361 | R= A - mulNTL (Q, B); |
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| 362 | } |
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| 363 | } |
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| 364 | |
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| 365 | void |
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| 366 | newtonDiv (const CanonicalForm& F, const CanonicalForm& G, CanonicalForm& Q) |
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| 367 | { |
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| 368 | CanonicalForm A= F; |
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| 369 | CanonicalForm B= G; |
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| 370 | Variable x= Variable (1); |
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| 371 | int degA= degree (A, x); |
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| 372 | int degB= degree (B, x); |
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| 373 | int m= degA - degB; |
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| 374 | |
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| 375 | if (m < 0) |
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| 376 | { |
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| 377 | Q= 0; |
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| 378 | return; |
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| 379 | } |
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| 380 | |
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| 381 | if (degB <= 1) |
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| 382 | Q= div (A, B); |
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| 383 | else |
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| 384 | { |
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| 385 | CanonicalForm R= uniReverse (A, degA); |
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| 386 | |
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| 387 | CanonicalForm revB= uniReverse (B, degB); |
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| 388 | revB= newtonInverse (revB, m + 1); |
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| 389 | Q= mulFLINTQTrunc (R, revB, m + 1); |
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| 390 | Q= uniReverse (Q, m); |
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| 391 | } |
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| 392 | } |
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| 393 | |
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| 394 | #endif |
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| 395 | |
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| 396 | CanonicalForm |
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[64c923] | 397 | mulNTL (const CanonicalForm& F, const CanonicalForm& G, const modpk& b) |
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[0e2e23] | 398 | { |
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| 399 | if (F.inCoeffDomain() || G.inCoeffDomain() || getCharacteristic() == 0) |
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| 400 | { |
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| 401 | Variable alpha; |
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| 402 | #ifdef HAVE_FLINT |
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| 403 | if ((!F.inCoeffDomain() && !G.inCoeffDomain()) && |
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| 404 | (hasFirstAlgVar (F, alpha) || hasFirstAlgVar (G, alpha))) |
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| 405 | { |
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[47dc5ea] | 406 | if (b.getp() != 0) |
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| 407 | { |
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| 408 | ZZ_p::init (convertFacCF2NTLZZ (b.getpk())); |
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| 409 | ZZ_pX NTLmipo= to_ZZ_pX (convertFacCF2NTLZZX (getMipo (alpha))); |
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| 410 | ZZ_pE::init (NTLmipo); |
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| 411 | ZZ_pEX NTLg= convertFacCF2NTLZZ_pEX (G, NTLmipo); |
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| 412 | ZZ_pEX NTLf= convertFacCF2NTLZZ_pEX (F, NTLmipo); |
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| 413 | mul (NTLf, NTLf, NTLg); |
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| 414 | return b (convertNTLZZ_pEX2CF (NTLf, F.mvar(), alpha)); |
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| 415 | } |
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[0e2e23] | 416 | CanonicalForm result= mulFLINTQa (F, G, alpha); |
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| 417 | return result; |
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| 418 | } |
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| 419 | else if (!F.inCoeffDomain() && !G.inCoeffDomain()) |
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[f9bd3d] | 420 | { |
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| 421 | if (b.getp() != 0) |
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[e785e9] | 422 | { |
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| 423 | fmpz_t FLINTpk; |
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[51aa162] | 424 | fmpz_init (FLINTpk); |
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| 425 | convertCF2Fmpz (FLINTpk, b.getpk()); |
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[e785e9] | 426 | fmpz_mod_poly_t FLINTF, FLINTG; |
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| 427 | convertFacCF2Fmpz_mod_poly_t (FLINTF, F, FLINTpk); |
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| 428 | convertFacCF2Fmpz_mod_poly_t (FLINTG, G, FLINTpk); |
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| 429 | fmpz_mod_poly_mul (FLINTF, FLINTF, FLINTG); |
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| 430 | CanonicalForm result= convertFmpz_mod_poly_t2FacCF (FLINTF, F.mvar(), b); |
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| 431 | fmpz_mod_poly_clear (FLINTG); |
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| 432 | fmpz_mod_poly_clear (FLINTF); |
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[51aa162] | 433 | fmpz_clear (FLINTpk); |
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[e785e9] | 434 | return result; |
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| 435 | } |
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[0e2e23] | 436 | return mulFLINTQ (F, G); |
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[f9bd3d] | 437 | } |
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[0e2e23] | 438 | #endif |
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[f9bd3d] | 439 | if (b.getp() != 0) |
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[47dc5ea] | 440 | { |
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| 441 | if (!F.inBaseDomain() && !G.inBaseDomain()) |
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| 442 | { |
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| 443 | if (hasFirstAlgVar (G, alpha) || hasFirstAlgVar (F, alpha)) |
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| 444 | { |
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| 445 | ZZ_p::init (convertFacCF2NTLZZ (b.getpk())); |
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| 446 | if (F.inCoeffDomain() && !G.inCoeffDomain()) |
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| 447 | { |
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| 448 | ZZ_pX NTLmipo= to_ZZ_pX (convertFacCF2NTLZZX (getMipo (alpha))); |
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| 449 | ZZ_pE::init (NTLmipo); |
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| 450 | ZZ_pEX NTLg= convertFacCF2NTLZZ_pEX (G, NTLmipo); |
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| 451 | ZZ_pX NTLf= convertFacCF2NTLZZpX (F); |
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| 452 | mul (NTLg, to_ZZ_pE (NTLf), NTLg); |
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| 453 | return b (convertNTLZZ_pEX2CF (NTLg, G.mvar(), alpha)); |
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| 454 | } |
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| 455 | else if (!F.inCoeffDomain() && G.inCoeffDomain()) |
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| 456 | { |
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| 457 | ZZ_pX NTLmipo= to_ZZ_pX (convertFacCF2NTLZZX (getMipo (alpha))); |
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| 458 | ZZ_pE::init (NTLmipo); |
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| 459 | ZZ_pX NTLg= convertFacCF2NTLZZpX (G); |
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| 460 | ZZ_pEX NTLf= convertFacCF2NTLZZ_pEX (F, NTLmipo); |
---|
| 461 | mul (NTLf, NTLf, to_ZZ_pE (NTLg)); |
---|
| 462 | return b (convertNTLZZ_pEX2CF (NTLf, F.mvar(), alpha)); |
---|
| 463 | } |
---|
| 464 | else |
---|
| 465 | { |
---|
| 466 | ZZ_pX NTLmipo= to_ZZ_pX (convertFacCF2NTLZZX (getMipo (alpha))); |
---|
| 467 | ZZ_pE::init (NTLmipo); |
---|
| 468 | ZZ_pX NTLg= convertFacCF2NTLZZpX (G); |
---|
| 469 | ZZ_pX NTLf= convertFacCF2NTLZZpX (F); |
---|
| 470 | ZZ_pE result; |
---|
| 471 | mul (result, to_ZZ_pE (NTLg), to_ZZ_pE (NTLf)); |
---|
| 472 | return b (convertNTLZZpX2CF (rep (result), alpha)); |
---|
| 473 | } |
---|
| 474 | } |
---|
| 475 | } |
---|
[f9bd3d] | 476 | return b (F*G); |
---|
[47dc5ea] | 477 | } |
---|
[0e2e23] | 478 | return F*G; |
---|
| 479 | } |
---|
| 480 | ASSERT (F.isUnivariate() && G.isUnivariate(), "expected univariate polys"); |
---|
| 481 | ASSERT (F.level() == G.level(), "expected polys of same level"); |
---|
| 482 | if (CFFactory::gettype() == GaloisFieldDomain) |
---|
| 483 | return F*G; |
---|
| 484 | zz_p::init (getCharacteristic()); |
---|
| 485 | Variable alpha; |
---|
| 486 | CanonicalForm result; |
---|
| 487 | if (hasFirstAlgVar (F, alpha) || hasFirstAlgVar (G, alpha)) |
---|
| 488 | { |
---|
| 489 | zz_pX NTLMipo= convertFacCF2NTLzzpX (getMipo (alpha)); |
---|
| 490 | zz_pE::init (NTLMipo); |
---|
| 491 | zz_pEX NTLF= convertFacCF2NTLzz_pEX (F, NTLMipo); |
---|
| 492 | zz_pEX NTLG= convertFacCF2NTLzz_pEX (G, NTLMipo); |
---|
| 493 | mul (NTLF, NTLF, NTLG); |
---|
| 494 | result= convertNTLzz_pEX2CF(NTLF, F.mvar(), alpha); |
---|
| 495 | } |
---|
| 496 | else |
---|
| 497 | { |
---|
| 498 | #ifdef HAVE_FLINT |
---|
| 499 | nmod_poly_t FLINTF, FLINTG; |
---|
| 500 | convertFacCF2nmod_poly_t (FLINTF, F); |
---|
| 501 | convertFacCF2nmod_poly_t (FLINTG, G); |
---|
| 502 | nmod_poly_mul (FLINTF, FLINTF, FLINTG); |
---|
| 503 | result= convertnmod_poly_t2FacCF (FLINTF, F.mvar()); |
---|
| 504 | nmod_poly_clear (FLINTF); |
---|
| 505 | nmod_poly_clear (FLINTG); |
---|
| 506 | #else |
---|
| 507 | zz_pX NTLF= convertFacCF2NTLzzpX (F); |
---|
| 508 | zz_pX NTLG= convertFacCF2NTLzzpX (G); |
---|
| 509 | mul (NTLF, NTLF, NTLG); |
---|
| 510 | result= convertNTLzzpX2CF(NTLF, F.mvar()); |
---|
| 511 | #endif |
---|
| 512 | } |
---|
| 513 | return result; |
---|
| 514 | } |
---|
| 515 | |
---|
| 516 | CanonicalForm |
---|
[64c923] | 517 | modNTL (const CanonicalForm& F, const CanonicalForm& G, const modpk& b) |
---|
[0e2e23] | 518 | { |
---|
| 519 | if (F.inCoeffDomain() && G.isUnivariate()) |
---|
[f9bd3d] | 520 | { |
---|
| 521 | if (b.getp() != 0) |
---|
| 522 | return b(F); |
---|
[0e2e23] | 523 | return F; |
---|
[f9bd3d] | 524 | } |
---|
[0e2e23] | 525 | else if (F.inCoeffDomain() && G.inCoeffDomain()) |
---|
[f9bd3d] | 526 | { |
---|
| 527 | if (b.getp() != 0) |
---|
| 528 | return b(F%G); |
---|
[0e2e23] | 529 | return mod (F, G); |
---|
[f9bd3d] | 530 | } |
---|
[0e2e23] | 531 | else if (F.isUnivariate() && G.inCoeffDomain()) |
---|
[f9bd3d] | 532 | { |
---|
| 533 | if (b.getp() != 0) |
---|
| 534 | return b(F%G); |
---|
[0e2e23] | 535 | return mod (F,G); |
---|
[f9bd3d] | 536 | } |
---|
[0e2e23] | 537 | |
---|
| 538 | if (getCharacteristic() == 0) |
---|
| 539 | { |
---|
| 540 | #ifdef HAVE_FLINT |
---|
| 541 | Variable alpha; |
---|
| 542 | if (!hasFirstAlgVar (F, alpha) && !hasFirstAlgVar (G, alpha)) |
---|
[f9bd3d] | 543 | { |
---|
| 544 | if (b.getp() != 0) |
---|
| 545 | { |
---|
[e785e9] | 546 | fmpz_t FLINTpk; |
---|
[51aa162] | 547 | fmpz_init (FLINTpk); |
---|
| 548 | convertCF2Fmpz (FLINTpk, b.getpk()); |
---|
[e785e9] | 549 | fmpz_mod_poly_t FLINTF, FLINTG; |
---|
| 550 | convertFacCF2Fmpz_mod_poly_t (FLINTF, F, FLINTpk); |
---|
| 551 | convertFacCF2Fmpz_mod_poly_t (FLINTG, G, FLINTpk); |
---|
| 552 | fmpz_mod_poly_rem (FLINTF, FLINTF, FLINTG); |
---|
| 553 | CanonicalForm result= convertFmpz_mod_poly_t2FacCF (FLINTF,F.mvar(),b); |
---|
| 554 | fmpz_mod_poly_clear (FLINTG); |
---|
| 555 | fmpz_mod_poly_clear (FLINTF); |
---|
[51aa162] | 556 | fmpz_clear (FLINTpk); |
---|
[e785e9] | 557 | return result; |
---|
[f9bd3d] | 558 | } |
---|
[0e2e23] | 559 | return modFLINTQ (F, G); |
---|
[f9bd3d] | 560 | } |
---|
[0e2e23] | 561 | else |
---|
| 562 | { |
---|
[47dc5ea] | 563 | if (b.getp() != 0) |
---|
| 564 | { |
---|
| 565 | ZZ_p::init (convertFacCF2NTLZZ (b.getpk())); |
---|
| 566 | ZZ_pX NTLmipo= to_ZZ_pX (convertFacCF2NTLZZX (getMipo (alpha))); |
---|
| 567 | ZZ_pE::init (NTLmipo); |
---|
| 568 | ZZ_pEX NTLg= convertFacCF2NTLZZ_pEX (G, NTLmipo); |
---|
| 569 | ZZ_pEX NTLf= convertFacCF2NTLZZ_pEX (F, NTLmipo); |
---|
| 570 | rem (NTLf, NTLf, NTLg); |
---|
| 571 | return b (convertNTLZZ_pEX2CF (NTLf, F.mvar(), alpha)); |
---|
| 572 | } |
---|
[0e2e23] | 573 | CanonicalForm Q, R; |
---|
| 574 | newtonDivrem (F, G, Q, R); |
---|
| 575 | return R; |
---|
| 576 | } |
---|
| 577 | #else |
---|
[f9bd3d] | 578 | if (b.getp() != 0) |
---|
| 579 | { |
---|
| 580 | ZZ NTLpk= power_ZZ (b.getp(), b.getk()); |
---|
| 581 | ZZ_p::init (NTLpk); |
---|
| 582 | ZZX ZZf= convertFacCF2NTLZZX (F); |
---|
| 583 | ZZX ZZg= convertFacCF2NTLZZX (G); |
---|
| 584 | ZZ_pX NTLf= to_ZZ_pX (ZZf); |
---|
| 585 | ZZ_pX NTLg= to_ZZ_pX (ZZg); |
---|
| 586 | rem (NTLf, NTLf, NTLg); |
---|
| 587 | return b (convertNTLZZX2CF (to_ZZX (NTLf), F.mvar())); |
---|
| 588 | } |
---|
[0e2e23] | 589 | return mod (F, G); |
---|
| 590 | #endif |
---|
| 591 | } |
---|
| 592 | |
---|
| 593 | ASSERT (F.isUnivariate() && G.isUnivariate(), "expected univariate polys"); |
---|
| 594 | ASSERT (F.level() == G.level(), "expected polys of same level"); |
---|
| 595 | if (CFFactory::gettype() == GaloisFieldDomain) |
---|
| 596 | return mod (F, G); |
---|
| 597 | zz_p::init (getCharacteristic()); |
---|
| 598 | Variable alpha; |
---|
| 599 | CanonicalForm result; |
---|
| 600 | if (hasFirstAlgVar (F, alpha) || hasFirstAlgVar (G, alpha)) |
---|
| 601 | { |
---|
| 602 | zz_pX NTLMipo= convertFacCF2NTLzzpX(getMipo (alpha)); |
---|
| 603 | zz_pE::init (NTLMipo); |
---|
| 604 | zz_pEX NTLF= convertFacCF2NTLzz_pEX (F, NTLMipo); |
---|
| 605 | zz_pEX NTLG= convertFacCF2NTLzz_pEX (G, NTLMipo); |
---|
| 606 | rem (NTLF, NTLF, NTLG); |
---|
| 607 | result= convertNTLzz_pEX2CF(NTLF, F.mvar(), alpha); |
---|
| 608 | } |
---|
| 609 | else |
---|
| 610 | { |
---|
| 611 | #ifdef HAVE_FLINT |
---|
| 612 | nmod_poly_t FLINTF, FLINTG; |
---|
| 613 | convertFacCF2nmod_poly_t (FLINTF, F); |
---|
| 614 | convertFacCF2nmod_poly_t (FLINTG, G); |
---|
| 615 | nmod_poly_divrem (FLINTG, FLINTF, FLINTF, FLINTG); |
---|
| 616 | result= convertnmod_poly_t2FacCF (FLINTF, F.mvar()); |
---|
| 617 | nmod_poly_clear (FLINTF); |
---|
| 618 | nmod_poly_clear (FLINTG); |
---|
| 619 | #else |
---|
| 620 | zz_pX NTLF= convertFacCF2NTLzzpX (F); |
---|
| 621 | zz_pX NTLG= convertFacCF2NTLzzpX (G); |
---|
| 622 | rem (NTLF, NTLF, NTLG); |
---|
| 623 | result= convertNTLzzpX2CF(NTLF, F.mvar()); |
---|
| 624 | #endif |
---|
| 625 | } |
---|
| 626 | return result; |
---|
| 627 | } |
---|
| 628 | |
---|
| 629 | CanonicalForm |
---|
[64c923] | 630 | divNTL (const CanonicalForm& F, const CanonicalForm& G, const modpk& b) |
---|
[0e2e23] | 631 | { |
---|
| 632 | if (F.inCoeffDomain() && G.isUnivariate()) |
---|
[f9bd3d] | 633 | { |
---|
| 634 | if (b.getp() != 0) |
---|
| 635 | return b(F); |
---|
[0e2e23] | 636 | return F; |
---|
[f9bd3d] | 637 | } |
---|
[0e2e23] | 638 | else if (F.inCoeffDomain() && G.inCoeffDomain()) |
---|
[f9bd3d] | 639 | { |
---|
| 640 | if (b.getp() != 0) |
---|
[47dc5ea] | 641 | { |
---|
| 642 | if (!F.inBaseDomain() || !G.inBaseDomain()) |
---|
| 643 | { |
---|
| 644 | Variable alpha; |
---|
| 645 | hasFirstAlgVar (F, alpha); |
---|
| 646 | hasFirstAlgVar (G, alpha); |
---|
| 647 | ZZ_p::init (convertFacCF2NTLZZ (b.getpk())); |
---|
| 648 | ZZ_pX NTLmipo= to_ZZ_pX (convertFacCF2NTLZZX (getMipo (alpha))); |
---|
| 649 | ZZ_pE::init (NTLmipo); |
---|
| 650 | ZZ_pX NTLg= convertFacCF2NTLZZpX (G); |
---|
| 651 | ZZ_pX NTLf= convertFacCF2NTLZZpX (F); |
---|
| 652 | ZZ_pE result; |
---|
| 653 | div (result, to_ZZ_pE (NTLg), to_ZZ_pE (NTLf)); |
---|
| 654 | return b (convertNTLZZpX2CF (rep (result), alpha)); |
---|
| 655 | } |
---|
[f9bd3d] | 656 | return b(div (F,G)); |
---|
[47dc5ea] | 657 | } |
---|
[0e2e23] | 658 | return div (F, G); |
---|
[f9bd3d] | 659 | } |
---|
[0e2e23] | 660 | else if (F.isUnivariate() && G.inCoeffDomain()) |
---|
[f9bd3d] | 661 | { |
---|
| 662 | if (b.getp() != 0) |
---|
[47dc5ea] | 663 | { |
---|
| 664 | if (!G.inBaseDomain()) |
---|
| 665 | { |
---|
| 666 | Variable alpha; |
---|
| 667 | hasFirstAlgVar (G, alpha); |
---|
| 668 | ZZ_p::init (convertFacCF2NTLZZ (b.getpk())); |
---|
| 669 | ZZ_pX NTLmipo= to_ZZ_pX (convertFacCF2NTLZZX (getMipo (alpha))); |
---|
| 670 | ZZ_pE::init (NTLmipo); |
---|
| 671 | ZZ_pX NTLg= convertFacCF2NTLZZpX (G); |
---|
| 672 | ZZ_pEX NTLf= convertFacCF2NTLZZ_pEX (F, NTLmipo); |
---|
| 673 | div (NTLf, NTLf, to_ZZ_pE (NTLg)); |
---|
| 674 | return b (convertNTLZZ_pEX2CF (NTLf, F.mvar(), alpha)); |
---|
| 675 | } |
---|
[f9bd3d] | 676 | return b(div (F,G)); |
---|
[47dc5ea] | 677 | } |
---|
[f9bd3d] | 678 | return div (F, G); |
---|
| 679 | } |
---|
[0e2e23] | 680 | |
---|
| 681 | if (getCharacteristic() == 0) |
---|
| 682 | { |
---|
| 683 | #ifdef HAVE_FLINT |
---|
| 684 | Variable alpha; |
---|
| 685 | if (!hasFirstAlgVar (F, alpha) && !hasFirstAlgVar (G, alpha)) |
---|
[f9bd3d] | 686 | { |
---|
| 687 | if (b.getp() != 0) |
---|
| 688 | { |
---|
[e785e9] | 689 | fmpz_t FLINTpk; |
---|
[51aa162] | 690 | fmpz_init (FLINTpk); |
---|
| 691 | convertCF2Fmpz (FLINTpk, b.getpk()); |
---|
[e785e9] | 692 | fmpz_mod_poly_t FLINTF, FLINTG; |
---|
| 693 | convertFacCF2Fmpz_mod_poly_t (FLINTF, F, FLINTpk); |
---|
| 694 | convertFacCF2Fmpz_mod_poly_t (FLINTG, G, FLINTpk); |
---|
| 695 | fmpz_mod_poly_divrem (FLINTF, FLINTG, FLINTF, FLINTG); |
---|
| 696 | CanonicalForm result= convertFmpz_mod_poly_t2FacCF (FLINTF,F.mvar(),b); |
---|
| 697 | fmpz_mod_poly_clear (FLINTG); |
---|
| 698 | fmpz_mod_poly_clear (FLINTF); |
---|
[51aa162] | 699 | fmpz_clear (FLINTpk); |
---|
[e785e9] | 700 | return result; |
---|
[f9bd3d] | 701 | } |
---|
[0e2e23] | 702 | return divFLINTQ (F,G); |
---|
[f9bd3d] | 703 | } |
---|
[0e2e23] | 704 | else |
---|
| 705 | { |
---|
[47dc5ea] | 706 | if (b.getp() != 0) |
---|
| 707 | { |
---|
| 708 | ZZ_p::init (convertFacCF2NTLZZ (b.getpk())); |
---|
| 709 | ZZ_pX NTLmipo= to_ZZ_pX (convertFacCF2NTLZZX (getMipo (alpha))); |
---|
| 710 | ZZ_pE::init (NTLmipo); |
---|
| 711 | ZZ_pEX NTLg= convertFacCF2NTLZZ_pEX (G, NTLmipo); |
---|
| 712 | ZZ_pEX NTLf= convertFacCF2NTLZZ_pEX (F, NTLmipo); |
---|
| 713 | div (NTLf, NTLf, NTLg); |
---|
| 714 | return b (convertNTLZZ_pEX2CF (NTLf, F.mvar(), alpha)); |
---|
| 715 | } |
---|
[0e2e23] | 716 | CanonicalForm Q; |
---|
| 717 | newtonDiv (F, G, Q); |
---|
| 718 | return Q; |
---|
| 719 | } |
---|
| 720 | #else |
---|
[f9bd3d] | 721 | if (b.getp() != 0) |
---|
| 722 | { |
---|
| 723 | ZZ NTLpk= power_ZZ (b.getp(), b.getk()); |
---|
| 724 | ZZ_p::init (NTLpk); |
---|
| 725 | ZZX ZZf= convertFacCF2NTLZZX (F); |
---|
| 726 | ZZX ZZg= convertFacCF2NTLZZX (G); |
---|
| 727 | ZZ_pX NTLf= to_ZZ_pX (ZZf); |
---|
| 728 | ZZ_pX NTLg= to_ZZ_pX (ZZg); |
---|
| 729 | div (NTLf, NTLf, NTLg); |
---|
| 730 | return b (convertNTLZZX2CF (to_ZZX (NTLf), F.mvar())); |
---|
| 731 | } |
---|
[0e2e23] | 732 | return div (F, G); |
---|
| 733 | #endif |
---|
| 734 | } |
---|
| 735 | |
---|
| 736 | ASSERT (F.isUnivariate() && G.isUnivariate(), "expected univariate polys"); |
---|
| 737 | ASSERT (F.level() == G.level(), "expected polys of same level"); |
---|
| 738 | if (CFFactory::gettype() == GaloisFieldDomain) |
---|
| 739 | return div (F, G); |
---|
| 740 | zz_p::init (getCharacteristic()); |
---|
| 741 | Variable alpha; |
---|
| 742 | CanonicalForm result; |
---|
| 743 | if (hasFirstAlgVar (F, alpha) || hasFirstAlgVar (G, alpha)) |
---|
| 744 | { |
---|
| 745 | zz_pX NTLMipo= convertFacCF2NTLzzpX(getMipo (alpha)); |
---|
| 746 | zz_pE::init (NTLMipo); |
---|
| 747 | zz_pEX NTLF= convertFacCF2NTLzz_pEX (F, NTLMipo); |
---|
| 748 | zz_pEX NTLG= convertFacCF2NTLzz_pEX (G, NTLMipo); |
---|
| 749 | div (NTLF, NTLF, NTLG); |
---|
| 750 | result= convertNTLzz_pEX2CF(NTLF, F.mvar(), alpha); |
---|
| 751 | } |
---|
| 752 | else |
---|
| 753 | { |
---|
| 754 | #ifdef HAVE_FLINT |
---|
| 755 | nmod_poly_t FLINTF, FLINTG; |
---|
| 756 | convertFacCF2nmod_poly_t (FLINTF, F); |
---|
| 757 | convertFacCF2nmod_poly_t (FLINTG, G); |
---|
| 758 | nmod_poly_div (FLINTF, FLINTF, FLINTG); |
---|
| 759 | result= convertnmod_poly_t2FacCF (FLINTF, F.mvar()); |
---|
| 760 | nmod_poly_clear (FLINTF); |
---|
| 761 | nmod_poly_clear (FLINTG); |
---|
| 762 | #else |
---|
| 763 | zz_pX NTLF= convertFacCF2NTLzzpX (F); |
---|
| 764 | zz_pX NTLG= convertFacCF2NTLzzpX (G); |
---|
| 765 | div (NTLF, NTLF, NTLG); |
---|
| 766 | result= convertNTLzzpX2CF(NTLF, F.mvar()); |
---|
| 767 | #endif |
---|
| 768 | } |
---|
| 769 | return result; |
---|
| 770 | } |
---|
| 771 | |
---|
[81d96c] | 772 | // end univariate polys |
---|
| 773 | //************************* |
---|
| 774 | // bivariate polys |
---|
| 775 | |
---|
[0e2e23] | 776 | #ifdef HAVE_FLINT |
---|
| 777 | void kronSubFp (nmod_poly_t result, const CanonicalForm& A, int d) |
---|
| 778 | { |
---|
| 779 | int degAy= degree (A); |
---|
| 780 | nmod_poly_init2 (result, getCharacteristic(), d*(degAy + 1)); |
---|
| 781 | |
---|
| 782 | nmod_poly_t buf; |
---|
| 783 | |
---|
| 784 | int j, k, bufRepLength; |
---|
| 785 | for (CFIterator i= A; i.hasTerms(); i++) |
---|
| 786 | { |
---|
| 787 | convertFacCF2nmod_poly_t (buf, i.coeff()); |
---|
| 788 | |
---|
| 789 | k= i.exp()*d; |
---|
| 790 | bufRepLength= (int) nmod_poly_length (buf); |
---|
| 791 | for (j= 0; j < bufRepLength; j++) |
---|
| 792 | nmod_poly_set_coeff_ui (result, j + k, nmod_poly_get_coeff_ui (buf, j)); |
---|
| 793 | nmod_poly_clear (buf); |
---|
| 794 | } |
---|
| 795 | _nmod_poly_normalise (result); |
---|
| 796 | } |
---|
| 797 | |
---|
| 798 | void kronSubQa (fmpq_poly_t result, const CanonicalForm& A, int d1, int d2) |
---|
| 799 | { |
---|
| 800 | int degAy= degree (A); |
---|
| 801 | fmpq_poly_init2 (result, d1*(degAy + 1)); |
---|
| 802 | |
---|
| 803 | fmpq_poly_t buf; |
---|
| 804 | fmpq_t coeff; |
---|
| 805 | |
---|
| 806 | int k, l, bufRepLength; |
---|
| 807 | CFIterator j; |
---|
| 808 | for (CFIterator i= A; i.hasTerms(); i++) |
---|
| 809 | { |
---|
| 810 | if (i.coeff().inCoeffDomain()) |
---|
| 811 | { |
---|
| 812 | k= d1*i.exp(); |
---|
| 813 | convertFacCF2Fmpq_poly_t (buf, i.coeff()); |
---|
| 814 | bufRepLength= (int) fmpq_poly_length(buf); |
---|
| 815 | for (l= 0; l < bufRepLength; l++) |
---|
| 816 | { |
---|
| 817 | fmpq_poly_get_coeff_fmpq (coeff, buf, l); |
---|
| 818 | fmpq_poly_set_coeff_fmpq (result, l + k, coeff); |
---|
| 819 | } |
---|
| 820 | fmpq_poly_clear (buf); |
---|
| 821 | } |
---|
| 822 | else |
---|
| 823 | { |
---|
| 824 | for (j= i.coeff(); j.hasTerms(); j++) |
---|
| 825 | { |
---|
| 826 | k= d1*i.exp(); |
---|
| 827 | k += d2*j.exp(); |
---|
| 828 | convertFacCF2Fmpq_poly_t (buf, j.coeff()); |
---|
| 829 | bufRepLength= (int) fmpq_poly_length(buf); |
---|
| 830 | for (l= 0; l < bufRepLength; l++) |
---|
| 831 | { |
---|
| 832 | fmpq_poly_get_coeff_fmpq (coeff, buf, l); |
---|
| 833 | fmpq_poly_set_coeff_fmpq (result, k + l, coeff); |
---|
| 834 | } |
---|
| 835 | fmpq_poly_clear (buf); |
---|
| 836 | } |
---|
| 837 | } |
---|
| 838 | } |
---|
| 839 | fmpq_clear (coeff); |
---|
| 840 | _fmpq_poly_normalise (result); |
---|
| 841 | } |
---|
| 842 | |
---|
[81d96c] | 843 | void |
---|
| 844 | kronSubReciproFp (nmod_poly_t subA1, nmod_poly_t subA2, const CanonicalForm& A, |
---|
| 845 | int d) |
---|
[0e2e23] | 846 | { |
---|
| 847 | int degAy= degree (A); |
---|
[81d96c] | 848 | mp_limb_t ninv= n_preinvert_limb (getCharacteristic()); |
---|
| 849 | nmod_poly_init2_preinv (subA1, getCharacteristic(), ninv, d*(degAy + 2)); |
---|
| 850 | nmod_poly_init2_preinv (subA2, getCharacteristic(), ninv, d*(degAy + 2)); |
---|
[0e2e23] | 851 | |
---|
[81d96c] | 852 | nmod_poly_t buf; |
---|
[0e2e23] | 853 | |
---|
[81d96c] | 854 | int k, kk, j, bufRepLength; |
---|
[0e2e23] | 855 | for (CFIterator i= A; i.hasTerms(); i++) |
---|
| 856 | { |
---|
[81d96c] | 857 | convertFacCF2nmod_poly_t (buf, i.coeff()); |
---|
[0e2e23] | 858 | |
---|
| 859 | k= i.exp()*d; |
---|
[81d96c] | 860 | kk= (degAy - i.exp())*d; |
---|
| 861 | bufRepLength= (int) nmod_poly_length (buf); |
---|
[0e2e23] | 862 | for (j= 0; j < bufRepLength; j++) |
---|
| 863 | { |
---|
[81d96c] | 864 | nmod_poly_set_coeff_ui (subA1, j + k, |
---|
| 865 | n_addmod (nmod_poly_get_coeff_ui (subA1, j+k), |
---|
| 866 | nmod_poly_get_coeff_ui (buf, j), |
---|
| 867 | getCharacteristic() |
---|
| 868 | ) |
---|
| 869 | ); |
---|
| 870 | nmod_poly_set_coeff_ui (subA2, j + kk, |
---|
| 871 | n_addmod (nmod_poly_get_coeff_ui (subA2, j + kk), |
---|
| 872 | nmod_poly_get_coeff_ui (buf, j), |
---|
| 873 | getCharacteristic() |
---|
| 874 | ) |
---|
| 875 | ); |
---|
[0e2e23] | 876 | } |
---|
[81d96c] | 877 | nmod_poly_clear (buf); |
---|
[0e2e23] | 878 | } |
---|
[81d96c] | 879 | _nmod_poly_normalise (subA1); |
---|
| 880 | _nmod_poly_normalise (subA2); |
---|
[0e2e23] | 881 | } |
---|
| 882 | |
---|
| 883 | void |
---|
[81d96c] | 884 | kronSubReciproQ (fmpz_poly_t subA1, fmpz_poly_t subA2, const CanonicalForm& A, |
---|
| 885 | int d) |
---|
[0e2e23] | 886 | { |
---|
| 887 | int degAy= degree (A); |
---|
[81d96c] | 888 | fmpz_poly_init2 (subA1, d*(degAy + 2)); |
---|
| 889 | fmpz_poly_init2 (subA2, d*(degAy + 2)); |
---|
[0e2e23] | 890 | |
---|
[81d96c] | 891 | fmpz_poly_t buf; |
---|
| 892 | fmpz_t coeff1, coeff2; |
---|
[0e2e23] | 893 | |
---|
[81d96c] | 894 | int k, kk, j, bufRepLength; |
---|
[0e2e23] | 895 | for (CFIterator i= A; i.hasTerms(); i++) |
---|
| 896 | { |
---|
[81d96c] | 897 | convertFacCF2Fmpz_poly_t (buf, i.coeff()); |
---|
[0e2e23] | 898 | |
---|
| 899 | k= i.exp()*d; |
---|
| 900 | kk= (degAy - i.exp())*d; |
---|
[81d96c] | 901 | bufRepLength= (int) fmpz_poly_length (buf); |
---|
[0e2e23] | 902 | for (j= 0; j < bufRepLength; j++) |
---|
| 903 | { |
---|
[81d96c] | 904 | fmpz_poly_get_coeff_fmpz (coeff1, subA1, j+k); |
---|
| 905 | fmpz_poly_get_coeff_fmpz (coeff2, buf, j); |
---|
| 906 | fmpz_add (coeff1, coeff1, coeff2); |
---|
| 907 | fmpz_poly_set_coeff_fmpz (subA1, j + k, coeff1); |
---|
| 908 | fmpz_poly_get_coeff_fmpz (coeff1, subA2, j + kk); |
---|
| 909 | fmpz_add (coeff1, coeff1, coeff2); |
---|
| 910 | fmpz_poly_set_coeff_fmpz (subA2, j + kk, coeff1); |
---|
[0e2e23] | 911 | } |
---|
[81d96c] | 912 | fmpz_poly_clear (buf); |
---|
[0e2e23] | 913 | } |
---|
[81d96c] | 914 | fmpz_clear (coeff1); |
---|
| 915 | fmpz_clear (coeff2); |
---|
| 916 | _fmpz_poly_normalise (subA1); |
---|
| 917 | _fmpz_poly_normalise (subA2); |
---|
[0e2e23] | 918 | } |
---|
| 919 | |
---|
[81d96c] | 920 | CanonicalForm reverseSubstQ (const fmpz_poly_t F, int d) |
---|
[0e2e23] | 921 | { |
---|
[81d96c] | 922 | Variable y= Variable (2); |
---|
| 923 | Variable x= Variable (1); |
---|
[0e2e23] | 924 | |
---|
[81d96c] | 925 | fmpz_poly_t f; |
---|
| 926 | fmpz_poly_init (f); |
---|
| 927 | fmpz_poly_set (f, F); |
---|
[0e2e23] | 928 | |
---|
[81d96c] | 929 | fmpz_poly_t buf; |
---|
| 930 | CanonicalForm result= 0; |
---|
| 931 | int i= 0; |
---|
| 932 | int degf= fmpz_poly_degree(f); |
---|
| 933 | int k= 0; |
---|
| 934 | int degfSubK, repLength, j; |
---|
| 935 | fmpz_t coeff; |
---|
| 936 | while (degf >= k) |
---|
[0e2e23] | 937 | { |
---|
[81d96c] | 938 | degfSubK= degf - k; |
---|
| 939 | if (degfSubK >= d) |
---|
| 940 | repLength= d; |
---|
| 941 | else |
---|
| 942 | repLength= degfSubK + 1; |
---|
[0e2e23] | 943 | |
---|
[81d96c] | 944 | fmpz_poly_init2 (buf, repLength); |
---|
| 945 | fmpz_init (coeff); |
---|
| 946 | for (j= 0; j < repLength; j++) |
---|
[0e2e23] | 947 | { |
---|
[81d96c] | 948 | fmpz_poly_get_coeff_fmpz (coeff, f, j + k); |
---|
| 949 | fmpz_poly_set_coeff_fmpz (buf, j, coeff); |
---|
[0e2e23] | 950 | } |
---|
[81d96c] | 951 | _fmpz_poly_normalise (buf); |
---|
| 952 | |
---|
| 953 | result += convertFmpz_poly_t2FacCF (buf, x)*power (y, i); |
---|
| 954 | i++; |
---|
| 955 | k= d*i; |
---|
| 956 | fmpz_poly_clear (buf); |
---|
| 957 | fmpz_clear (coeff); |
---|
[0e2e23] | 958 | } |
---|
[81d96c] | 959 | fmpz_poly_clear (f); |
---|
| 960 | |
---|
| 961 | return result; |
---|
[0e2e23] | 962 | } |
---|
| 963 | |
---|
[67ed74] | 964 | CanonicalForm |
---|
| 965 | reverseSubstQa (const fmpq_poly_t F, int d1, int d2, const Variable& alpha, |
---|
| 966 | const fmpq_poly_t mipo) |
---|
| 967 | { |
---|
| 968 | Variable y= Variable (2); |
---|
| 969 | Variable x= Variable (1); |
---|
| 970 | |
---|
| 971 | fmpq_poly_t f; |
---|
| 972 | fmpq_poly_init (f); |
---|
| 973 | fmpq_poly_set (f, F); |
---|
| 974 | |
---|
| 975 | fmpq_poly_t buf; |
---|
| 976 | CanonicalForm result= 0, result2; |
---|
| 977 | int i= 0; |
---|
| 978 | int degf= fmpq_poly_degree(f); |
---|
| 979 | int k= 0; |
---|
| 980 | int degfSubK; |
---|
| 981 | int repLength; |
---|
| 982 | fmpq_t coeff; |
---|
| 983 | while (degf >= k) |
---|
| 984 | { |
---|
| 985 | degfSubK= degf - k; |
---|
| 986 | if (degfSubK >= d1) |
---|
| 987 | repLength= d1; |
---|
| 988 | else |
---|
| 989 | repLength= degfSubK + 1; |
---|
| 990 | |
---|
| 991 | fmpq_init (coeff); |
---|
| 992 | int j= 0; |
---|
| 993 | int l; |
---|
| 994 | result2= 0; |
---|
| 995 | while (j*d2 < repLength) |
---|
| 996 | { |
---|
| 997 | fmpq_poly_init2 (buf, d2); |
---|
| 998 | for (l= 0; l < d2; l++) |
---|
| 999 | { |
---|
| 1000 | fmpq_poly_get_coeff_fmpq (coeff, f, k + j*d2 + l); |
---|
| 1001 | fmpq_poly_set_coeff_fmpq (buf, l, coeff); |
---|
| 1002 | } |
---|
| 1003 | _fmpq_poly_normalise (buf); |
---|
| 1004 | fmpq_poly_rem (buf, buf, mipo); |
---|
| 1005 | result2 += convertFmpq_poly_t2FacCF (buf, alpha)*power (x, j); |
---|
| 1006 | j++; |
---|
| 1007 | fmpq_poly_clear (buf); |
---|
| 1008 | } |
---|
| 1009 | if (repLength - j*d2 != 0 && j*d2 - repLength < d2) |
---|
| 1010 | { |
---|
| 1011 | j--; |
---|
| 1012 | repLength -= j*d2; |
---|
| 1013 | fmpq_poly_init2 (buf, repLength); |
---|
| 1014 | j++; |
---|
| 1015 | for (l= 0; l < repLength; l++) |
---|
| 1016 | { |
---|
| 1017 | fmpq_poly_get_coeff_fmpq (coeff, f, k + j*d2 + l); |
---|
| 1018 | fmpq_poly_set_coeff_fmpq (buf, l, coeff); |
---|
| 1019 | } |
---|
| 1020 | _fmpq_poly_normalise (buf); |
---|
| 1021 | fmpq_poly_rem (buf, buf, mipo); |
---|
| 1022 | result2 += convertFmpq_poly_t2FacCF (buf, alpha)*power (x, j); |
---|
| 1023 | fmpq_poly_clear (buf); |
---|
| 1024 | } |
---|
| 1025 | fmpq_clear (coeff); |
---|
| 1026 | |
---|
| 1027 | result += result2*power (y, i); |
---|
| 1028 | i++; |
---|
| 1029 | k= d1*i; |
---|
| 1030 | } |
---|
| 1031 | |
---|
| 1032 | fmpq_poly_clear (f); |
---|
| 1033 | return result; |
---|
| 1034 | } |
---|
| 1035 | |
---|
[0e2e23] | 1036 | CanonicalForm |
---|
[81d96c] | 1037 | reverseSubstReciproFp (const nmod_poly_t F, const nmod_poly_t G, int d, int k) |
---|
[0e2e23] | 1038 | { |
---|
| 1039 | Variable y= Variable (2); |
---|
| 1040 | Variable x= Variable (1); |
---|
| 1041 | |
---|
[81d96c] | 1042 | nmod_poly_t f, g; |
---|
| 1043 | mp_limb_t ninv= n_preinvert_limb (getCharacteristic()); |
---|
| 1044 | nmod_poly_init_preinv (f, getCharacteristic(), ninv); |
---|
| 1045 | nmod_poly_init_preinv (g, getCharacteristic(), ninv); |
---|
| 1046 | nmod_poly_set (f, F); |
---|
| 1047 | nmod_poly_set (g, G); |
---|
| 1048 | int degf= nmod_poly_degree(f); |
---|
| 1049 | int degg= nmod_poly_degree(g); |
---|
[0e2e23] | 1050 | |
---|
| 1051 | |
---|
[81d96c] | 1052 | nmod_poly_t buf1,buf2, buf3; |
---|
| 1053 | |
---|
| 1054 | if (nmod_poly_length (f) < (long) d*(k+1)) //zero padding |
---|
| 1055 | nmod_poly_fit_length (f,(long)d*(k+1)); |
---|
[0e2e23] | 1056 | |
---|
| 1057 | CanonicalForm result= 0; |
---|
| 1058 | int i= 0; |
---|
| 1059 | int lf= 0; |
---|
| 1060 | int lg= d*k; |
---|
| 1061 | int degfSubLf= degf; |
---|
| 1062 | int deggSubLg= degg-lg; |
---|
| 1063 | int repLengthBuf2, repLengthBuf1, ind, tmp; |
---|
| 1064 | while (degf >= lf || lg >= 0) |
---|
| 1065 | { |
---|
| 1066 | if (degfSubLf >= d) |
---|
| 1067 | repLengthBuf1= d; |
---|
| 1068 | else if (degfSubLf < 0) |
---|
| 1069 | repLengthBuf1= 0; |
---|
| 1070 | else |
---|
| 1071 | repLengthBuf1= degfSubLf + 1; |
---|
[81d96c] | 1072 | nmod_poly_init2_preinv (buf1, getCharacteristic(), ninv, repLengthBuf1); |
---|
[0e2e23] | 1073 | |
---|
| 1074 | for (ind= 0; ind < repLengthBuf1; ind++) |
---|
[81d96c] | 1075 | nmod_poly_set_coeff_ui (buf1, ind, nmod_poly_get_coeff_ui (f, ind+lf)); |
---|
| 1076 | _nmod_poly_normalise (buf1); |
---|
[0e2e23] | 1077 | |
---|
[81d96c] | 1078 | repLengthBuf1= nmod_poly_length (buf1); |
---|
[0e2e23] | 1079 | |
---|
| 1080 | if (deggSubLg >= d - 1) |
---|
| 1081 | repLengthBuf2= d - 1; |
---|
| 1082 | else if (deggSubLg < 0) |
---|
| 1083 | repLengthBuf2= 0; |
---|
| 1084 | else |
---|
| 1085 | repLengthBuf2= deggSubLg + 1; |
---|
| 1086 | |
---|
[81d96c] | 1087 | nmod_poly_init2_preinv (buf2, getCharacteristic(), ninv, repLengthBuf2); |
---|
[0e2e23] | 1088 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1089 | nmod_poly_set_coeff_ui (buf2, ind, nmod_poly_get_coeff_ui (g, ind + lg)); |
---|
[0e2e23] | 1090 | |
---|
[81d96c] | 1091 | _nmod_poly_normalise (buf2); |
---|
| 1092 | repLengthBuf2= nmod_poly_length (buf2); |
---|
[0e2e23] | 1093 | |
---|
[81d96c] | 1094 | nmod_poly_init2_preinv (buf3, getCharacteristic(), ninv, repLengthBuf2 + d); |
---|
[0e2e23] | 1095 | for (ind= 0; ind < repLengthBuf1; ind++) |
---|
[81d96c] | 1096 | nmod_poly_set_coeff_ui (buf3, ind, nmod_poly_get_coeff_ui (buf1, ind)); |
---|
[0e2e23] | 1097 | for (ind= repLengthBuf1; ind < d; ind++) |
---|
[81d96c] | 1098 | nmod_poly_set_coeff_ui (buf3, ind, 0); |
---|
[0e2e23] | 1099 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1100 | nmod_poly_set_coeff_ui (buf3, ind+d, nmod_poly_get_coeff_ui (buf2, ind)); |
---|
| 1101 | _nmod_poly_normalise (buf3); |
---|
[0e2e23] | 1102 | |
---|
[81d96c] | 1103 | result += convertnmod_poly_t2FacCF (buf3, x)*power (y, i); |
---|
[0e2e23] | 1104 | i++; |
---|
| 1105 | |
---|
| 1106 | |
---|
| 1107 | lf= i*d; |
---|
| 1108 | degfSubLf= degf - lf; |
---|
| 1109 | |
---|
| 1110 | lg= d*(k-i); |
---|
| 1111 | deggSubLg= degg - lg; |
---|
| 1112 | |
---|
| 1113 | if (lg >= 0 && deggSubLg > 0) |
---|
| 1114 | { |
---|
| 1115 | if (repLengthBuf2 > degfSubLf + 1) |
---|
| 1116 | degfSubLf= repLengthBuf2 - 1; |
---|
| 1117 | tmp= tmin (repLengthBuf1, deggSubLg + 1); |
---|
| 1118 | for (ind= 0; ind < tmp; ind++) |
---|
[81d96c] | 1119 | nmod_poly_set_coeff_ui (g, ind + lg, |
---|
| 1120 | n_submod (nmod_poly_get_coeff_ui (g, ind + lg), |
---|
| 1121 | nmod_poly_get_coeff_ui (buf1, ind), |
---|
| 1122 | getCharacteristic() |
---|
| 1123 | ) |
---|
| 1124 | ); |
---|
[0e2e23] | 1125 | } |
---|
| 1126 | if (lg < 0) |
---|
[81d96c] | 1127 | { |
---|
| 1128 | nmod_poly_clear (buf1); |
---|
| 1129 | nmod_poly_clear (buf2); |
---|
| 1130 | nmod_poly_clear (buf3); |
---|
[0e2e23] | 1131 | break; |
---|
[81d96c] | 1132 | } |
---|
[0e2e23] | 1133 | if (degfSubLf >= 0) |
---|
| 1134 | { |
---|
| 1135 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1136 | nmod_poly_set_coeff_ui (f, ind + lf, |
---|
| 1137 | n_submod (nmod_poly_get_coeff_ui (f, ind + lf), |
---|
| 1138 | nmod_poly_get_coeff_ui (buf2, ind), |
---|
| 1139 | getCharacteristic() |
---|
| 1140 | ) |
---|
| 1141 | ); |
---|
[0e2e23] | 1142 | } |
---|
[81d96c] | 1143 | nmod_poly_clear (buf1); |
---|
| 1144 | nmod_poly_clear (buf2); |
---|
| 1145 | nmod_poly_clear (buf3); |
---|
[0e2e23] | 1146 | } |
---|
| 1147 | |
---|
[81d96c] | 1148 | nmod_poly_clear (f); |
---|
| 1149 | nmod_poly_clear (g); |
---|
| 1150 | |
---|
[0e2e23] | 1151 | return result; |
---|
| 1152 | } |
---|
| 1153 | |
---|
| 1154 | CanonicalForm |
---|
[81d96c] | 1155 | reverseSubstReciproQ (const fmpz_poly_t F, const fmpz_poly_t G, int d, int k) |
---|
[0e2e23] | 1156 | { |
---|
| 1157 | Variable y= Variable (2); |
---|
| 1158 | Variable x= Variable (1); |
---|
| 1159 | |
---|
[81d96c] | 1160 | fmpz_poly_t f, g; |
---|
| 1161 | fmpz_poly_init (f); |
---|
| 1162 | fmpz_poly_init (g); |
---|
| 1163 | fmpz_poly_set (f, F); |
---|
| 1164 | fmpz_poly_set (g, G); |
---|
| 1165 | int degf= fmpz_poly_degree(f); |
---|
| 1166 | int degg= fmpz_poly_degree(g); |
---|
[0e2e23] | 1167 | |
---|
| 1168 | |
---|
[81d96c] | 1169 | fmpz_poly_t buf1,buf2, buf3; |
---|
[0e2e23] | 1170 | |
---|
[81d96c] | 1171 | if (fmpz_poly_length (f) < (long) d*(k+1)) //zero padding |
---|
| 1172 | fmpz_poly_fit_length (f,(long)d*(k+1)); |
---|
[0e2e23] | 1173 | |
---|
| 1174 | CanonicalForm result= 0; |
---|
| 1175 | int i= 0; |
---|
| 1176 | int lf= 0; |
---|
| 1177 | int lg= d*k; |
---|
| 1178 | int degfSubLf= degf; |
---|
| 1179 | int deggSubLg= degg-lg; |
---|
| 1180 | int repLengthBuf2, repLengthBuf1, ind, tmp; |
---|
[81d96c] | 1181 | fmpz_t tmp1, tmp2; |
---|
[0e2e23] | 1182 | while (degf >= lf || lg >= 0) |
---|
| 1183 | { |
---|
| 1184 | if (degfSubLf >= d) |
---|
| 1185 | repLengthBuf1= d; |
---|
| 1186 | else if (degfSubLf < 0) |
---|
| 1187 | repLengthBuf1= 0; |
---|
| 1188 | else |
---|
| 1189 | repLengthBuf1= degfSubLf + 1; |
---|
| 1190 | |
---|
[81d96c] | 1191 | fmpz_poly_init2 (buf1, repLengthBuf1); |
---|
| 1192 | |
---|
[0e2e23] | 1193 | for (ind= 0; ind < repLengthBuf1; ind++) |
---|
[81d96c] | 1194 | { |
---|
| 1195 | fmpz_poly_get_coeff_fmpz (tmp1, f, ind + lf); |
---|
| 1196 | fmpz_poly_set_coeff_fmpz (buf1, ind, tmp1); |
---|
| 1197 | } |
---|
| 1198 | _fmpz_poly_normalise (buf1); |
---|
[0e2e23] | 1199 | |
---|
[81d96c] | 1200 | repLengthBuf1= fmpz_poly_length (buf1); |
---|
[0e2e23] | 1201 | |
---|
| 1202 | if (deggSubLg >= d - 1) |
---|
| 1203 | repLengthBuf2= d - 1; |
---|
| 1204 | else if (deggSubLg < 0) |
---|
| 1205 | repLengthBuf2= 0; |
---|
| 1206 | else |
---|
| 1207 | repLengthBuf2= deggSubLg + 1; |
---|
| 1208 | |
---|
[81d96c] | 1209 | fmpz_poly_init2 (buf2, repLengthBuf2); |
---|
[0e2e23] | 1210 | |
---|
[81d96c] | 1211 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
| 1212 | { |
---|
| 1213 | fmpz_poly_get_coeff_fmpz (tmp1, g, ind + lg); |
---|
| 1214 | fmpz_poly_set_coeff_fmpz (buf2, ind, tmp1); |
---|
| 1215 | } |
---|
[0e2e23] | 1216 | |
---|
[81d96c] | 1217 | _fmpz_poly_normalise (buf2); |
---|
| 1218 | repLengthBuf2= fmpz_poly_length (buf2); |
---|
[0e2e23] | 1219 | |
---|
[81d96c] | 1220 | fmpz_poly_init2 (buf3, repLengthBuf2 + d); |
---|
[0e2e23] | 1221 | for (ind= 0; ind < repLengthBuf1; ind++) |
---|
[81d96c] | 1222 | { |
---|
[e016ba] | 1223 | fmpz_poly_get_coeff_fmpz (tmp1, buf1, ind); |
---|
[81d96c] | 1224 | fmpz_poly_set_coeff_fmpz (buf3, ind, tmp1); |
---|
| 1225 | } |
---|
[0e2e23] | 1226 | for (ind= repLengthBuf1; ind < d; ind++) |
---|
[81d96c] | 1227 | fmpz_poly_set_coeff_ui (buf3, ind, 0); |
---|
[0e2e23] | 1228 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1229 | { |
---|
| 1230 | fmpz_poly_get_coeff_fmpz (tmp1, buf2, ind); |
---|
| 1231 | fmpz_poly_set_coeff_fmpz (buf3, ind + d, tmp1); |
---|
| 1232 | } |
---|
| 1233 | _fmpz_poly_normalise (buf3); |
---|
[0e2e23] | 1234 | |
---|
[81d96c] | 1235 | result += convertFmpz_poly_t2FacCF (buf3, x)*power (y, i); |
---|
[0e2e23] | 1236 | i++; |
---|
| 1237 | |
---|
| 1238 | |
---|
| 1239 | lf= i*d; |
---|
| 1240 | degfSubLf= degf - lf; |
---|
| 1241 | |
---|
| 1242 | lg= d*(k-i); |
---|
| 1243 | deggSubLg= degg - lg; |
---|
| 1244 | |
---|
| 1245 | if (lg >= 0 && deggSubLg > 0) |
---|
| 1246 | { |
---|
| 1247 | if (repLengthBuf2 > degfSubLf + 1) |
---|
| 1248 | degfSubLf= repLengthBuf2 - 1; |
---|
| 1249 | tmp= tmin (repLengthBuf1, deggSubLg + 1); |
---|
| 1250 | for (ind= 0; ind < tmp; ind++) |
---|
[81d96c] | 1251 | { |
---|
| 1252 | fmpz_poly_get_coeff_fmpz (tmp1, g, ind + lg); |
---|
| 1253 | fmpz_poly_get_coeff_fmpz (tmp2, buf1, ind); |
---|
| 1254 | fmpz_sub (tmp1, tmp1, tmp2); |
---|
| 1255 | fmpz_poly_set_coeff_fmpz (g, ind + lg, tmp1); |
---|
| 1256 | } |
---|
[0e2e23] | 1257 | } |
---|
| 1258 | if (lg < 0) |
---|
[81d96c] | 1259 | { |
---|
| 1260 | fmpz_poly_clear (buf1); |
---|
| 1261 | fmpz_poly_clear (buf2); |
---|
| 1262 | fmpz_poly_clear (buf3); |
---|
[0e2e23] | 1263 | break; |
---|
[81d96c] | 1264 | } |
---|
[0e2e23] | 1265 | if (degfSubLf >= 0) |
---|
| 1266 | { |
---|
| 1267 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1268 | { |
---|
| 1269 | fmpz_poly_get_coeff_fmpz (tmp1, f, ind + lf); |
---|
| 1270 | fmpz_poly_get_coeff_fmpz (tmp2, buf2, ind); |
---|
| 1271 | fmpz_sub (tmp1, tmp1, tmp2); |
---|
| 1272 | fmpz_poly_set_coeff_fmpz (f, ind + lf, tmp1); |
---|
| 1273 | } |
---|
[0e2e23] | 1274 | } |
---|
[81d96c] | 1275 | fmpz_poly_clear (buf1); |
---|
| 1276 | fmpz_poly_clear (buf2); |
---|
| 1277 | fmpz_poly_clear (buf3); |
---|
[0e2e23] | 1278 | } |
---|
| 1279 | |
---|
[81d96c] | 1280 | fmpz_poly_clear (f); |
---|
| 1281 | fmpz_poly_clear (g); |
---|
| 1282 | fmpz_clear (tmp1); |
---|
| 1283 | fmpz_clear (tmp2); |
---|
[0e2e23] | 1284 | |
---|
| 1285 | return result; |
---|
| 1286 | } |
---|
| 1287 | |
---|
[81d96c] | 1288 | CanonicalForm reverseSubstFp (const nmod_poly_t F, int d) |
---|
[0e2e23] | 1289 | { |
---|
| 1290 | Variable y= Variable (2); |
---|
| 1291 | Variable x= Variable (1); |
---|
| 1292 | |
---|
[81d96c] | 1293 | nmod_poly_t f; |
---|
| 1294 | mp_limb_t ninv= n_preinvert_limb (getCharacteristic()); |
---|
| 1295 | nmod_poly_init_preinv (f, getCharacteristic(), ninv); |
---|
| 1296 | nmod_poly_set (f, F); |
---|
[0e2e23] | 1297 | |
---|
[81d96c] | 1298 | nmod_poly_t buf; |
---|
[0e2e23] | 1299 | CanonicalForm result= 0; |
---|
| 1300 | int i= 0; |
---|
[81d96c] | 1301 | int degf= nmod_poly_degree(f); |
---|
[0e2e23] | 1302 | int k= 0; |
---|
| 1303 | int degfSubK, repLength, j; |
---|
| 1304 | while (degf >= k) |
---|
| 1305 | { |
---|
| 1306 | degfSubK= degf - k; |
---|
| 1307 | if (degfSubK >= d) |
---|
| 1308 | repLength= d; |
---|
| 1309 | else |
---|
| 1310 | repLength= degfSubK + 1; |
---|
| 1311 | |
---|
[81d96c] | 1312 | nmod_poly_init2_preinv (buf, getCharacteristic(), ninv, repLength); |
---|
[0e2e23] | 1313 | for (j= 0; j < repLength; j++) |
---|
[81d96c] | 1314 | nmod_poly_set_coeff_ui (buf, j, nmod_poly_get_coeff_ui (f, j + k)); |
---|
| 1315 | _nmod_poly_normalise (buf); |
---|
[0e2e23] | 1316 | |
---|
[81d96c] | 1317 | result += convertnmod_poly_t2FacCF (buf, x)*power (y, i); |
---|
[0e2e23] | 1318 | i++; |
---|
| 1319 | k= d*i; |
---|
[81d96c] | 1320 | nmod_poly_clear (buf); |
---|
[0e2e23] | 1321 | } |
---|
[81d96c] | 1322 | nmod_poly_clear (f); |
---|
[0e2e23] | 1323 | |
---|
| 1324 | return result; |
---|
| 1325 | } |
---|
| 1326 | |
---|
| 1327 | CanonicalForm |
---|
[81d96c] | 1328 | mulMod2FLINTFpReci (const CanonicalForm& F, const CanonicalForm& G, const |
---|
| 1329 | CanonicalForm& M) |
---|
[0e2e23] | 1330 | { |
---|
[81d96c] | 1331 | int d1= tmax (degree (F, 1), degree (G, 1)) + 1; |
---|
[0e2e23] | 1332 | d1 /= 2; |
---|
| 1333 | d1 += 1; |
---|
| 1334 | |
---|
[81d96c] | 1335 | nmod_poly_t F1, F2; |
---|
| 1336 | mp_limb_t ninv= n_preinvert_limb (getCharacteristic()); |
---|
| 1337 | nmod_poly_init_preinv (F1, getCharacteristic(), ninv); |
---|
| 1338 | nmod_poly_init_preinv (F2, getCharacteristic(), ninv); |
---|
| 1339 | kronSubReciproFp (F1, F2, F, d1); |
---|
| 1340 | |
---|
| 1341 | nmod_poly_t G1, G2; |
---|
| 1342 | nmod_poly_init_preinv (G1, getCharacteristic(), ninv); |
---|
| 1343 | nmod_poly_init_preinv (G2, getCharacteristic(), ninv); |
---|
| 1344 | kronSubReciproFp (G1, G2, G, d1); |
---|
[0e2e23] | 1345 | |
---|
| 1346 | int k= d1*degree (M); |
---|
[81d96c] | 1347 | nmod_poly_mullow (F1, F1, G1, (long) k); |
---|
[0e2e23] | 1348 | |
---|
[81d96c] | 1349 | int degtailF= degree (tailcoeff (F), 1);; |
---|
[0e2e23] | 1350 | int degtailG= degree (tailcoeff (G), 1); |
---|
| 1351 | int taildegF= taildegree (F); |
---|
| 1352 | int taildegG= taildegree (G); |
---|
| 1353 | |
---|
[81d96c] | 1354 | int b= nmod_poly_degree (F2) + nmod_poly_degree (G2) - k - degtailF - degtailG |
---|
| 1355 | + d1*(2+taildegF + taildegG); |
---|
| 1356 | nmod_poly_mulhigh (F2, F2, G2, b); |
---|
| 1357 | nmod_poly_shift_right (F2, F2, b); |
---|
| 1358 | int d2= tmax (nmod_poly_degree (F2)/d1, nmod_poly_degree (F1)/d1); |
---|
[0e2e23] | 1359 | |
---|
[81d96c] | 1360 | |
---|
| 1361 | CanonicalForm result= reverseSubstReciproFp (F1, F2, d1, d2); |
---|
| 1362 | |
---|
| 1363 | nmod_poly_clear (F1); |
---|
| 1364 | nmod_poly_clear (F2); |
---|
| 1365 | nmod_poly_clear (G1); |
---|
| 1366 | nmod_poly_clear (G2); |
---|
| 1367 | return result; |
---|
[0e2e23] | 1368 | } |
---|
| 1369 | |
---|
| 1370 | CanonicalForm |
---|
[81d96c] | 1371 | mulMod2FLINTFp (const CanonicalForm& F, const CanonicalForm& G, const |
---|
| 1372 | CanonicalForm& M) |
---|
[0e2e23] | 1373 | { |
---|
| 1374 | CanonicalForm A= F; |
---|
| 1375 | CanonicalForm B= G; |
---|
| 1376 | |
---|
| 1377 | int degAx= degree (A, 1); |
---|
| 1378 | int degAy= degree (A, 2); |
---|
| 1379 | int degBx= degree (B, 1); |
---|
| 1380 | int degBy= degree (B, 2); |
---|
| 1381 | int d1= degAx + 1 + degBx; |
---|
| 1382 | int d2= tmax (degAy, degBy); |
---|
| 1383 | |
---|
| 1384 | if (d1 > 128 && d2 > 160 && (degAy == degBy) && (2*degAy > degree (M))) |
---|
[81d96c] | 1385 | return mulMod2FLINTFpReci (A, B, M); |
---|
[0e2e23] | 1386 | |
---|
[81d96c] | 1387 | nmod_poly_t FLINTA, FLINTB; |
---|
| 1388 | mp_limb_t ninv= n_preinvert_limb (getCharacteristic()); |
---|
| 1389 | nmod_poly_init_preinv (FLINTA, getCharacteristic(), ninv); |
---|
| 1390 | nmod_poly_init_preinv (FLINTB, getCharacteristic(), ninv); |
---|
| 1391 | kronSubFp (FLINTA, A, d1); |
---|
| 1392 | kronSubFp (FLINTB, B, d1); |
---|
[0e2e23] | 1393 | |
---|
| 1394 | int k= d1*degree (M); |
---|
[81d96c] | 1395 | nmod_poly_mullow (FLINTA, FLINTA, FLINTB, (long) k); |
---|
[0e2e23] | 1396 | |
---|
[81d96c] | 1397 | A= reverseSubstFp (FLINTA, d1); |
---|
[0e2e23] | 1398 | |
---|
[81d96c] | 1399 | nmod_poly_clear (FLINTA); |
---|
| 1400 | nmod_poly_clear (FLINTB); |
---|
[0e2e23] | 1401 | return A; |
---|
| 1402 | } |
---|
| 1403 | |
---|
| 1404 | CanonicalForm |
---|
[81d96c] | 1405 | mulMod2FLINTQReci (const CanonicalForm& F, const CanonicalForm& G, const |
---|
| 1406 | CanonicalForm& M) |
---|
| 1407 | { |
---|
| 1408 | int d1= tmax (degree (F, 1), degree (G, 1)) + 1; |
---|
[0e2e23] | 1409 | d1 /= 2; |
---|
| 1410 | d1 += 1; |
---|
| 1411 | |
---|
[81d96c] | 1412 | fmpz_poly_t F1, F2; |
---|
| 1413 | fmpz_poly_init (F1); |
---|
| 1414 | fmpz_poly_init (F2); |
---|
| 1415 | kronSubReciproQ (F1, F2, F, d1); |
---|
| 1416 | |
---|
| 1417 | fmpz_poly_t G1, G2; |
---|
| 1418 | fmpz_poly_init (G1); |
---|
| 1419 | fmpz_poly_init (G2); |
---|
| 1420 | kronSubReciproQ (G1, G2, G, d1); |
---|
[0e2e23] | 1421 | |
---|
| 1422 | int k= d1*degree (M); |
---|
[81d96c] | 1423 | fmpz_poly_mullow (F1, F1, G1, (long) k); |
---|
[0e2e23] | 1424 | |
---|
[81d96c] | 1425 | int degtailF= degree (tailcoeff (F), 1);; |
---|
[0e2e23] | 1426 | int degtailG= degree (tailcoeff (G), 1); |
---|
| 1427 | int taildegF= taildegree (F); |
---|
| 1428 | int taildegG= taildegree (G); |
---|
| 1429 | |
---|
[81d96c] | 1430 | int b= fmpz_poly_degree (F2) + fmpz_poly_degree (G2) - k - degtailF - degtailG |
---|
| 1431 | + d1*(2+taildegF + taildegG); |
---|
| 1432 | fmpz_poly_mulhigh_n (F2, F2, G2, b); |
---|
| 1433 | fmpz_poly_shift_right (F2, F2, b); |
---|
| 1434 | int d2= tmax (fmpz_poly_degree (F2)/d1, fmpz_poly_degree (F1)/d1); |
---|
[0e2e23] | 1435 | |
---|
[81d96c] | 1436 | CanonicalForm result= reverseSubstReciproQ (F1, F2, d1, d2); |
---|
[0e2e23] | 1437 | |
---|
[81d96c] | 1438 | fmpz_poly_clear (F1); |
---|
| 1439 | fmpz_poly_clear (F2); |
---|
| 1440 | fmpz_poly_clear (G1); |
---|
| 1441 | fmpz_poly_clear (G2); |
---|
| 1442 | return result; |
---|
| 1443 | } |
---|
[0e2e23] | 1444 | |
---|
| 1445 | CanonicalForm |
---|
[81d96c] | 1446 | mulMod2FLINTQ (const CanonicalForm& F, const CanonicalForm& G, const |
---|
| 1447 | CanonicalForm& M) |
---|
[0e2e23] | 1448 | { |
---|
| 1449 | CanonicalForm A= F; |
---|
| 1450 | CanonicalForm B= G; |
---|
| 1451 | |
---|
[81d96c] | 1452 | int degAx= degree (A, 1); |
---|
| 1453 | int degBx= degree (B, 1); |
---|
| 1454 | int d1= degAx + 1 + degBx; |
---|
[0e2e23] | 1455 | |
---|
[81d96c] | 1456 | CanonicalForm f= bCommonDen (F); |
---|
| 1457 | CanonicalForm g= bCommonDen (G); |
---|
| 1458 | A *= f; |
---|
| 1459 | B *= g; |
---|
[0e2e23] | 1460 | |
---|
[81d96c] | 1461 | fmpz_poly_t FLINTA, FLINTB; |
---|
| 1462 | fmpz_poly_init (FLINTA); |
---|
| 1463 | fmpz_poly_init (FLINTB); |
---|
| 1464 | kronSub (FLINTA, A, d1); |
---|
| 1465 | kronSub (FLINTB, B, d1); |
---|
| 1466 | int k= d1*degree (M); |
---|
[0e2e23] | 1467 | |
---|
[81d96c] | 1468 | fmpz_poly_mullow (FLINTA, FLINTA, FLINTB, (long) k); |
---|
| 1469 | A= reverseSubstQ (FLINTA, d1); |
---|
| 1470 | fmpz_poly_clear (FLINTA); |
---|
| 1471 | fmpz_poly_clear (FLINTB); |
---|
| 1472 | return A/(f*g); |
---|
| 1473 | } |
---|
[0e2e23] | 1474 | |
---|
[67ed74] | 1475 | CanonicalForm |
---|
| 1476 | mulMod2FLINTQa (const CanonicalForm& F, const CanonicalForm& G, |
---|
| 1477 | const CanonicalForm& M) |
---|
| 1478 | { |
---|
| 1479 | Variable a; |
---|
| 1480 | if (!hasFirstAlgVar (F,a) && !hasFirstAlgVar (G, a)) |
---|
| 1481 | return mulMod2FLINTQ (F, G, M); |
---|
| 1482 | CanonicalForm A= F; |
---|
| 1483 | |
---|
| 1484 | int degFx= degree (F, 1); |
---|
| 1485 | int degFa= degree (F, a); |
---|
| 1486 | int degGx= degree (G, 1); |
---|
| 1487 | int degGa= degree (G, a); |
---|
| 1488 | |
---|
| 1489 | int d2= degFa+degGa+1; |
---|
| 1490 | int d1= degFx + 1 + degGx; |
---|
| 1491 | d1 *= d2; |
---|
| 1492 | |
---|
| 1493 | fmpq_poly_t FLINTF, FLINTG; |
---|
| 1494 | kronSubQa (FLINTF, F, d1, d2); |
---|
| 1495 | kronSubQa (FLINTG, G, d1, d2); |
---|
| 1496 | |
---|
| 1497 | fmpq_poly_mullow (FLINTF, FLINTF, FLINTG, d1*degree (M)); |
---|
| 1498 | |
---|
| 1499 | fmpq_poly_t mipo; |
---|
| 1500 | convertFacCF2Fmpq_poly_t (mipo, getMipo (a)); |
---|
| 1501 | CanonicalForm result= reverseSubstQa (FLINTF, d1, d2, a, mipo); |
---|
| 1502 | fmpq_poly_clear (FLINTF); |
---|
| 1503 | fmpq_poly_clear (FLINTG); |
---|
| 1504 | return result; |
---|
| 1505 | } |
---|
| 1506 | |
---|
[0e2e23] | 1507 | #endif |
---|
| 1508 | |
---|
[81d96c] | 1509 | zz_pX kronSubFp (const CanonicalForm& A, int d) |
---|
[0e2e23] | 1510 | { |
---|
| 1511 | int degAy= degree (A); |
---|
[81d96c] | 1512 | zz_pX result; |
---|
| 1513 | result.rep.SetLength (d*(degAy + 1)); |
---|
[0e2e23] | 1514 | |
---|
[81d96c] | 1515 | zz_p *resultp; |
---|
| 1516 | resultp= result.rep.elts(); |
---|
| 1517 | zz_pX buf; |
---|
| 1518 | zz_p *bufp; |
---|
| 1519 | int j, k, bufRepLength; |
---|
[0e2e23] | 1520 | |
---|
| 1521 | for (CFIterator i= A; i.hasTerms(); i++) |
---|
| 1522 | { |
---|
[81d96c] | 1523 | if (i.coeff().inCoeffDomain()) |
---|
| 1524 | buf= convertFacCF2NTLzzpX (i.coeff()); |
---|
| 1525 | else |
---|
| 1526 | buf= convertFacCF2NTLzzpX (i.coeff()); |
---|
[0e2e23] | 1527 | |
---|
| 1528 | k= i.exp()*d; |
---|
[81d96c] | 1529 | bufp= buf.rep.elts(); |
---|
| 1530 | bufRepLength= (int) buf.rep.length(); |
---|
[0e2e23] | 1531 | for (j= 0; j < bufRepLength; j++) |
---|
[81d96c] | 1532 | resultp [j + k]= bufp [j]; |
---|
| 1533 | } |
---|
| 1534 | result.normalize(); |
---|
| 1535 | |
---|
| 1536 | return result; |
---|
| 1537 | } |
---|
| 1538 | |
---|
| 1539 | zz_pEX kronSubFq (const CanonicalForm& A, int d, const Variable& alpha) |
---|
| 1540 | { |
---|
| 1541 | int degAy= degree (A); |
---|
| 1542 | zz_pEX result; |
---|
| 1543 | result.rep.SetLength (d*(degAy + 1)); |
---|
| 1544 | |
---|
| 1545 | Variable v; |
---|
| 1546 | zz_pE *resultp; |
---|
| 1547 | resultp= result.rep.elts(); |
---|
| 1548 | zz_pEX buf1; |
---|
| 1549 | zz_pE *buf1p; |
---|
| 1550 | zz_pX buf2; |
---|
| 1551 | zz_pX NTLMipo= convertFacCF2NTLzzpX (getMipo (alpha)); |
---|
| 1552 | int j, k, buf1RepLength; |
---|
| 1553 | |
---|
| 1554 | for (CFIterator i= A; i.hasTerms(); i++) |
---|
| 1555 | { |
---|
| 1556 | if (i.coeff().inCoeffDomain()) |
---|
[0e2e23] | 1557 | { |
---|
[81d96c] | 1558 | buf2= convertFacCF2NTLzzpX (i.coeff()); |
---|
| 1559 | buf1= to_zz_pEX (to_zz_pE (buf2)); |
---|
[0e2e23] | 1560 | } |
---|
[81d96c] | 1561 | else |
---|
| 1562 | buf1= convertFacCF2NTLzz_pEX (i.coeff(), NTLMipo); |
---|
| 1563 | |
---|
| 1564 | k= i.exp()*d; |
---|
| 1565 | buf1p= buf1.rep.elts(); |
---|
| 1566 | buf1RepLength= (int) buf1.rep.length(); |
---|
| 1567 | for (j= 0; j < buf1RepLength; j++) |
---|
| 1568 | resultp [j + k]= buf1p [j]; |
---|
[0e2e23] | 1569 | } |
---|
[81d96c] | 1570 | result.normalize(); |
---|
| 1571 | |
---|
| 1572 | return result; |
---|
[0e2e23] | 1573 | } |
---|
| 1574 | |
---|
| 1575 | void |
---|
[81d96c] | 1576 | kronSubReciproFq (zz_pEX& subA1, zz_pEX& subA2,const CanonicalForm& A, int d, |
---|
| 1577 | const Variable& alpha) |
---|
[0e2e23] | 1578 | { |
---|
| 1579 | int degAy= degree (A); |
---|
[81d96c] | 1580 | subA1.rep.SetLength ((long) d*(degAy + 2)); |
---|
| 1581 | subA2.rep.SetLength ((long) d*(degAy + 2)); |
---|
[0e2e23] | 1582 | |
---|
[81d96c] | 1583 | Variable v; |
---|
| 1584 | zz_pE *subA1p; |
---|
| 1585 | zz_pE *subA2p; |
---|
| 1586 | subA1p= subA1.rep.elts(); |
---|
| 1587 | subA2p= subA2.rep.elts(); |
---|
| 1588 | zz_pEX buf; |
---|
| 1589 | zz_pE *bufp; |
---|
| 1590 | zz_pX buf2; |
---|
| 1591 | zz_pX NTLMipo= convertFacCF2NTLzzpX (getMipo (alpha)); |
---|
| 1592 | int j, k, kk, bufRepLength; |
---|
[0e2e23] | 1593 | |
---|
| 1594 | for (CFIterator i= A; i.hasTerms(); i++) |
---|
| 1595 | { |
---|
[81d96c] | 1596 | if (i.coeff().inCoeffDomain()) |
---|
| 1597 | { |
---|
| 1598 | buf2= convertFacCF2NTLzzpX (i.coeff()); |
---|
| 1599 | buf= to_zz_pEX (to_zz_pE (buf2)); |
---|
| 1600 | } |
---|
| 1601 | else |
---|
| 1602 | buf= convertFacCF2NTLzz_pEX (i.coeff(), NTLMipo); |
---|
[0e2e23] | 1603 | |
---|
| 1604 | k= i.exp()*d; |
---|
| 1605 | kk= (degAy - i.exp())*d; |
---|
[81d96c] | 1606 | bufp= buf.rep.elts(); |
---|
| 1607 | bufRepLength= (int) buf.rep.length(); |
---|
[0e2e23] | 1608 | for (j= 0; j < bufRepLength; j++) |
---|
| 1609 | { |
---|
[81d96c] | 1610 | subA1p [j + k] += bufp [j]; |
---|
| 1611 | subA2p [j + kk] += bufp [j]; |
---|
[0e2e23] | 1612 | } |
---|
| 1613 | } |
---|
[81d96c] | 1614 | subA1.normalize(); |
---|
| 1615 | subA2.normalize(); |
---|
[0e2e23] | 1616 | } |
---|
| 1617 | |
---|
[81d96c] | 1618 | void |
---|
| 1619 | kronSubReciproFp (zz_pX& subA1, zz_pX& subA2, const CanonicalForm& A, int d) |
---|
[0e2e23] | 1620 | { |
---|
[81d96c] | 1621 | int degAy= degree (A); |
---|
| 1622 | subA1.rep.SetLength ((long) d*(degAy + 2)); |
---|
| 1623 | subA2.rep.SetLength ((long) d*(degAy + 2)); |
---|
[0e2e23] | 1624 | |
---|
[81d96c] | 1625 | zz_p *subA1p; |
---|
| 1626 | zz_p *subA2p; |
---|
| 1627 | subA1p= subA1.rep.elts(); |
---|
| 1628 | subA2p= subA2.rep.elts(); |
---|
| 1629 | zz_pX buf; |
---|
| 1630 | zz_p *bufp; |
---|
| 1631 | int j, k, kk, bufRepLength; |
---|
[0e2e23] | 1632 | |
---|
[81d96c] | 1633 | for (CFIterator i= A; i.hasTerms(); i++) |
---|
[0e2e23] | 1634 | { |
---|
[81d96c] | 1635 | buf= convertFacCF2NTLzzpX (i.coeff()); |
---|
[0e2e23] | 1636 | |
---|
[81d96c] | 1637 | k= i.exp()*d; |
---|
| 1638 | kk= (degAy - i.exp())*d; |
---|
| 1639 | bufp= buf.rep.elts(); |
---|
| 1640 | bufRepLength= (int) buf.rep.length(); |
---|
| 1641 | for (j= 0; j < bufRepLength; j++) |
---|
[0e2e23] | 1642 | { |
---|
[81d96c] | 1643 | subA1p [j + k] += bufp [j]; |
---|
| 1644 | subA2p [j + kk] += bufp [j]; |
---|
[0e2e23] | 1645 | } |
---|
| 1646 | } |
---|
[81d96c] | 1647 | subA1.normalize(); |
---|
| 1648 | subA2.normalize(); |
---|
[0e2e23] | 1649 | } |
---|
| 1650 | |
---|
| 1651 | CanonicalForm |
---|
[81d96c] | 1652 | reverseSubstReciproFq (const zz_pEX& F, const zz_pEX& G, int d, int k, |
---|
| 1653 | const Variable& alpha) |
---|
[0e2e23] | 1654 | { |
---|
| 1655 | Variable y= Variable (2); |
---|
| 1656 | Variable x= Variable (1); |
---|
| 1657 | |
---|
[81d96c] | 1658 | zz_pEX f= F; |
---|
| 1659 | zz_pEX g= G; |
---|
| 1660 | int degf= deg(f); |
---|
| 1661 | int degg= deg(g); |
---|
[0e2e23] | 1662 | |
---|
[81d96c] | 1663 | zz_pEX buf1; |
---|
| 1664 | zz_pEX buf2; |
---|
| 1665 | zz_pEX buf3; |
---|
[0e2e23] | 1666 | |
---|
[81d96c] | 1667 | zz_pE *buf1p; |
---|
| 1668 | zz_pE *buf2p; |
---|
| 1669 | zz_pE *buf3p; |
---|
| 1670 | if (f.rep.length() < (long) d*(k+1)) //zero padding |
---|
| 1671 | f.rep.SetLength ((long)d*(k+1)); |
---|
[0e2e23] | 1672 | |
---|
[81d96c] | 1673 | zz_pE *gp= g.rep.elts(); |
---|
| 1674 | zz_pE *fp= f.rep.elts(); |
---|
[0e2e23] | 1675 | CanonicalForm result= 0; |
---|
| 1676 | int i= 0; |
---|
| 1677 | int lf= 0; |
---|
| 1678 | int lg= d*k; |
---|
| 1679 | int degfSubLf= degf; |
---|
| 1680 | int deggSubLg= degg-lg; |
---|
| 1681 | int repLengthBuf2, repLengthBuf1, ind, tmp; |
---|
[81d96c] | 1682 | zz_pE zzpEZero= zz_pE(); |
---|
| 1683 | |
---|
[0e2e23] | 1684 | while (degf >= lf || lg >= 0) |
---|
| 1685 | { |
---|
| 1686 | if (degfSubLf >= d) |
---|
| 1687 | repLengthBuf1= d; |
---|
| 1688 | else if (degfSubLf < 0) |
---|
| 1689 | repLengthBuf1= 0; |
---|
| 1690 | else |
---|
| 1691 | repLengthBuf1= degfSubLf + 1; |
---|
[81d96c] | 1692 | buf1.rep.SetLength((long) repLengthBuf1); |
---|
[0e2e23] | 1693 | |
---|
[81d96c] | 1694 | buf1p= buf1.rep.elts(); |
---|
[0e2e23] | 1695 | for (ind= 0; ind < repLengthBuf1; ind++) |
---|
[81d96c] | 1696 | buf1p [ind]= fp [ind + lf]; |
---|
| 1697 | buf1.normalize(); |
---|
[0e2e23] | 1698 | |
---|
[81d96c] | 1699 | repLengthBuf1= buf1.rep.length(); |
---|
[0e2e23] | 1700 | |
---|
| 1701 | if (deggSubLg >= d - 1) |
---|
| 1702 | repLengthBuf2= d - 1; |
---|
| 1703 | else if (deggSubLg < 0) |
---|
| 1704 | repLengthBuf2= 0; |
---|
| 1705 | else |
---|
| 1706 | repLengthBuf2= deggSubLg + 1; |
---|
| 1707 | |
---|
[81d96c] | 1708 | buf2.rep.SetLength ((long) repLengthBuf2); |
---|
| 1709 | buf2p= buf2.rep.elts(); |
---|
[0e2e23] | 1710 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1711 | buf2p [ind]= gp [ind + lg]; |
---|
| 1712 | buf2.normalize(); |
---|
[0e2e23] | 1713 | |
---|
[81d96c] | 1714 | repLengthBuf2= buf2.rep.length(); |
---|
[0e2e23] | 1715 | |
---|
[81d96c] | 1716 | buf3.rep.SetLength((long) repLengthBuf2 + d); |
---|
| 1717 | buf3p= buf3.rep.elts(); |
---|
| 1718 | buf2p= buf2.rep.elts(); |
---|
| 1719 | buf1p= buf1.rep.elts(); |
---|
[0e2e23] | 1720 | for (ind= 0; ind < repLengthBuf1; ind++) |
---|
[81d96c] | 1721 | buf3p [ind]= buf1p [ind]; |
---|
[0e2e23] | 1722 | for (ind= repLengthBuf1; ind < d; ind++) |
---|
[81d96c] | 1723 | buf3p [ind]= zzpEZero; |
---|
[0e2e23] | 1724 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1725 | buf3p [ind + d]= buf2p [ind]; |
---|
| 1726 | buf3.normalize(); |
---|
[0e2e23] | 1727 | |
---|
[81d96c] | 1728 | result += convertNTLzz_pEX2CF (buf3, x, alpha)*power (y, i); |
---|
[0e2e23] | 1729 | i++; |
---|
| 1730 | |
---|
| 1731 | |
---|
| 1732 | lf= i*d; |
---|
| 1733 | degfSubLf= degf - lf; |
---|
| 1734 | |
---|
| 1735 | lg= d*(k-i); |
---|
| 1736 | deggSubLg= degg - lg; |
---|
| 1737 | |
---|
[81d96c] | 1738 | buf1p= buf1.rep.elts(); |
---|
| 1739 | |
---|
[0e2e23] | 1740 | if (lg >= 0 && deggSubLg > 0) |
---|
| 1741 | { |
---|
| 1742 | if (repLengthBuf2 > degfSubLf + 1) |
---|
| 1743 | degfSubLf= repLengthBuf2 - 1; |
---|
| 1744 | tmp= tmin (repLengthBuf1, deggSubLg + 1); |
---|
| 1745 | for (ind= 0; ind < tmp; ind++) |
---|
[81d96c] | 1746 | gp [ind + lg] -= buf1p [ind]; |
---|
[0e2e23] | 1747 | } |
---|
[81d96c] | 1748 | |
---|
[0e2e23] | 1749 | if (lg < 0) |
---|
| 1750 | break; |
---|
[81d96c] | 1751 | |
---|
| 1752 | buf2p= buf2.rep.elts(); |
---|
[0e2e23] | 1753 | if (degfSubLf >= 0) |
---|
| 1754 | { |
---|
| 1755 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1756 | fp [ind + lf] -= buf2p [ind]; |
---|
[0e2e23] | 1757 | } |
---|
| 1758 | } |
---|
| 1759 | |
---|
| 1760 | return result; |
---|
| 1761 | } |
---|
| 1762 | |
---|
| 1763 | CanonicalForm |
---|
[81d96c] | 1764 | reverseSubstReciproFp (const zz_pX& F, const zz_pX& G, int d, int k) |
---|
[0e2e23] | 1765 | { |
---|
| 1766 | Variable y= Variable (2); |
---|
| 1767 | Variable x= Variable (1); |
---|
| 1768 | |
---|
[81d96c] | 1769 | zz_pX f= F; |
---|
| 1770 | zz_pX g= G; |
---|
| 1771 | int degf= deg(f); |
---|
| 1772 | int degg= deg(g); |
---|
[0e2e23] | 1773 | |
---|
[81d96c] | 1774 | zz_pX buf1; |
---|
| 1775 | zz_pX buf2; |
---|
| 1776 | zz_pX buf3; |
---|
[0e2e23] | 1777 | |
---|
[81d96c] | 1778 | zz_p *buf1p; |
---|
| 1779 | zz_p *buf2p; |
---|
| 1780 | zz_p *buf3p; |
---|
[0e2e23] | 1781 | |
---|
[81d96c] | 1782 | if (f.rep.length() < (long) d*(k+1)) //zero padding |
---|
| 1783 | f.rep.SetLength ((long)d*(k+1)); |
---|
[0e2e23] | 1784 | |
---|
[81d96c] | 1785 | zz_p *gp= g.rep.elts(); |
---|
| 1786 | zz_p *fp= f.rep.elts(); |
---|
[0e2e23] | 1787 | CanonicalForm result= 0; |
---|
| 1788 | int i= 0; |
---|
| 1789 | int lf= 0; |
---|
| 1790 | int lg= d*k; |
---|
| 1791 | int degfSubLf= degf; |
---|
| 1792 | int deggSubLg= degg-lg; |
---|
| 1793 | int repLengthBuf2, repLengthBuf1, ind, tmp; |
---|
[81d96c] | 1794 | zz_p zzpZero= zz_p(); |
---|
[0e2e23] | 1795 | while (degf >= lf || lg >= 0) |
---|
| 1796 | { |
---|
| 1797 | if (degfSubLf >= d) |
---|
| 1798 | repLengthBuf1= d; |
---|
| 1799 | else if (degfSubLf < 0) |
---|
| 1800 | repLengthBuf1= 0; |
---|
| 1801 | else |
---|
| 1802 | repLengthBuf1= degfSubLf + 1; |
---|
[81d96c] | 1803 | buf1.rep.SetLength((long) repLengthBuf1); |
---|
[0e2e23] | 1804 | |
---|
[81d96c] | 1805 | buf1p= buf1.rep.elts(); |
---|
[0e2e23] | 1806 | for (ind= 0; ind < repLengthBuf1; ind++) |
---|
[81d96c] | 1807 | buf1p [ind]= fp [ind + lf]; |
---|
| 1808 | buf1.normalize(); |
---|
[0e2e23] | 1809 | |
---|
[81d96c] | 1810 | repLengthBuf1= buf1.rep.length(); |
---|
[0e2e23] | 1811 | |
---|
| 1812 | if (deggSubLg >= d - 1) |
---|
| 1813 | repLengthBuf2= d - 1; |
---|
| 1814 | else if (deggSubLg < 0) |
---|
| 1815 | repLengthBuf2= 0; |
---|
| 1816 | else |
---|
| 1817 | repLengthBuf2= deggSubLg + 1; |
---|
| 1818 | |
---|
[81d96c] | 1819 | buf2.rep.SetLength ((long) repLengthBuf2); |
---|
| 1820 | buf2p= buf2.rep.elts(); |
---|
[0e2e23] | 1821 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1822 | buf2p [ind]= gp [ind + lg]; |
---|
[0e2e23] | 1823 | |
---|
[81d96c] | 1824 | buf2.normalize(); |
---|
[0e2e23] | 1825 | |
---|
[81d96c] | 1826 | repLengthBuf2= buf2.rep.length(); |
---|
| 1827 | |
---|
| 1828 | |
---|
| 1829 | buf3.rep.SetLength((long) repLengthBuf2 + d); |
---|
| 1830 | buf3p= buf3.rep.elts(); |
---|
| 1831 | buf2p= buf2.rep.elts(); |
---|
| 1832 | buf1p= buf1.rep.elts(); |
---|
[0e2e23] | 1833 | for (ind= 0; ind < repLengthBuf1; ind++) |
---|
[81d96c] | 1834 | buf3p [ind]= buf1p [ind]; |
---|
[0e2e23] | 1835 | for (ind= repLengthBuf1; ind < d; ind++) |
---|
[81d96c] | 1836 | buf3p [ind]= zzpZero; |
---|
[0e2e23] | 1837 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1838 | buf3p [ind + d]= buf2p [ind]; |
---|
| 1839 | buf3.normalize(); |
---|
[0e2e23] | 1840 | |
---|
[81d96c] | 1841 | result += convertNTLzzpX2CF (buf3, x)*power (y, i); |
---|
[0e2e23] | 1842 | i++; |
---|
| 1843 | |
---|
| 1844 | |
---|
| 1845 | lf= i*d; |
---|
| 1846 | degfSubLf= degf - lf; |
---|
| 1847 | |
---|
| 1848 | lg= d*(k-i); |
---|
| 1849 | deggSubLg= degg - lg; |
---|
| 1850 | |
---|
[81d96c] | 1851 | buf1p= buf1.rep.elts(); |
---|
| 1852 | |
---|
[0e2e23] | 1853 | if (lg >= 0 && deggSubLg > 0) |
---|
| 1854 | { |
---|
| 1855 | if (repLengthBuf2 > degfSubLf + 1) |
---|
| 1856 | degfSubLf= repLengthBuf2 - 1; |
---|
| 1857 | tmp= tmin (repLengthBuf1, deggSubLg + 1); |
---|
| 1858 | for (ind= 0; ind < tmp; ind++) |
---|
[81d96c] | 1859 | gp [ind + lg] -= buf1p [ind]; |
---|
[0e2e23] | 1860 | } |
---|
| 1861 | if (lg < 0) |
---|
| 1862 | break; |
---|
[81d96c] | 1863 | |
---|
| 1864 | buf2p= buf2.rep.elts(); |
---|
[0e2e23] | 1865 | if (degfSubLf >= 0) |
---|
| 1866 | { |
---|
| 1867 | for (ind= 0; ind < repLengthBuf2; ind++) |
---|
[81d96c] | 1868 | fp [ind + lf] -= buf2p [ind]; |
---|
[0e2e23] | 1869 | } |
---|
| 1870 | } |
---|
| 1871 | |
---|
[81d96c] | 1872 | return result; |
---|
| 1873 | } |
---|
| 1874 | |
---|
| 1875 | CanonicalForm reverseSubstFq (const zz_pEX& F, int d, const Variable& alpha) |
---|
| 1876 | { |
---|
| 1877 | Variable y= Variable (2); |
---|
| 1878 | Variable x= Variable (1); |
---|
| 1879 | |
---|
| 1880 | zz_pEX f= F; |
---|
| 1881 | zz_pE *fp= f.rep.elts(); |
---|
| 1882 | |
---|
| 1883 | zz_pEX buf; |
---|
| 1884 | zz_pE *bufp; |
---|
| 1885 | CanonicalForm result= 0; |
---|
| 1886 | int i= 0; |
---|
| 1887 | int degf= deg(f); |
---|
| 1888 | int k= 0; |
---|
| 1889 | int degfSubK, repLength, j; |
---|
| 1890 | while (degf >= k) |
---|
| 1891 | { |
---|
| 1892 | degfSubK= degf - k; |
---|
| 1893 | if (degfSubK >= d) |
---|
| 1894 | repLength= d; |
---|
| 1895 | else |
---|
| 1896 | repLength= degfSubK + 1; |
---|
| 1897 | |
---|
| 1898 | buf.rep.SetLength ((long) repLength); |
---|
| 1899 | bufp= buf.rep.elts(); |
---|
| 1900 | for (j= 0; j < repLength; j++) |
---|
| 1901 | bufp [j]= fp [j + k]; |
---|
| 1902 | buf.normalize(); |
---|
| 1903 | |
---|
| 1904 | result += convertNTLzz_pEX2CF (buf, x, alpha)*power (y, i); |
---|
| 1905 | i++; |
---|
| 1906 | k= d*i; |
---|
| 1907 | } |
---|
[0e2e23] | 1908 | |
---|
| 1909 | return result; |
---|
| 1910 | } |
---|
| 1911 | |
---|
[81d96c] | 1912 | CanonicalForm reverseSubstFp (const zz_pX& F, int d) |
---|
[0e2e23] | 1913 | { |
---|
| 1914 | Variable y= Variable (2); |
---|
| 1915 | Variable x= Variable (1); |
---|
| 1916 | |
---|
[81d96c] | 1917 | zz_pX f= F; |
---|
| 1918 | zz_p *fp= f.rep.elts(); |
---|
[0e2e23] | 1919 | |
---|
[81d96c] | 1920 | zz_pX buf; |
---|
| 1921 | zz_p *bufp; |
---|
[0e2e23] | 1922 | CanonicalForm result= 0; |
---|
| 1923 | int i= 0; |
---|
[81d96c] | 1924 | int degf= deg(f); |
---|
[0e2e23] | 1925 | int k= 0; |
---|
| 1926 | int degfSubK, repLength, j; |
---|
| 1927 | while (degf >= k) |
---|
| 1928 | { |
---|
| 1929 | degfSubK= degf - k; |
---|
| 1930 | if (degfSubK >= d) |
---|
| 1931 | repLength= d; |
---|
| 1932 | else |
---|
| 1933 | repLength= degfSubK + 1; |
---|
| 1934 | |
---|
[81d96c] | 1935 | buf.rep.SetLength ((long) repLength); |
---|
| 1936 | bufp= buf.rep.elts(); |
---|
[0e2e23] | 1937 | for (j= 0; j < repLength; j++) |
---|
[81d96c] | 1938 | bufp [j]= fp [j + k]; |
---|
| 1939 | buf.normalize(); |
---|
[0e2e23] | 1940 | |
---|
[81d96c] | 1941 | result += convertNTLzzpX2CF (buf, x)*power (y, i); |
---|
[0e2e23] | 1942 | i++; |
---|
| 1943 | k= d*i; |
---|
| 1944 | } |
---|
| 1945 | |
---|
| 1946 | return result; |
---|
| 1947 | } |
---|
| 1948 | |
---|
[81d96c] | 1949 | // assumes input to be reduced mod M and to be an element of Fq not Fp |
---|
[0e2e23] | 1950 | CanonicalForm |
---|
[81d96c] | 1951 | mulMod2NTLFpReci (const CanonicalForm& F, const CanonicalForm& G, const |
---|
| 1952 | CanonicalForm& M) |
---|
[0e2e23] | 1953 | { |
---|
[81d96c] | 1954 | int d1= degree (F, 1) + degree (G, 1) + 1; |
---|
[0e2e23] | 1955 | d1 /= 2; |
---|
| 1956 | d1 += 1; |
---|
| 1957 | |
---|
[81d96c] | 1958 | zz_pX F1, F2; |
---|
| 1959 | kronSubReciproFp (F1, F2, F, d1); |
---|
| 1960 | zz_pX G1, G2; |
---|
| 1961 | kronSubReciproFp (G1, G2, G, d1); |
---|
[0e2e23] | 1962 | |
---|
| 1963 | int k= d1*degree (M); |
---|
[81d96c] | 1964 | MulTrunc (F1, F1, G1, (long) k); |
---|
[0e2e23] | 1965 | |
---|
[81d96c] | 1966 | int degtailF= degree (tailcoeff (F), 1); |
---|
[0e2e23] | 1967 | int degtailG= degree (tailcoeff (G), 1); |
---|
| 1968 | int taildegF= taildegree (F); |
---|
| 1969 | int taildegG= taildegree (G); |
---|
[81d96c] | 1970 | int b= k + degtailF + degtailG - d1*(2+taildegF+taildegG); |
---|
[0e2e23] | 1971 | |
---|
[81d96c] | 1972 | reverse (F2, F2); |
---|
| 1973 | reverse (G2, G2); |
---|
| 1974 | MulTrunc (F2, F2, G2, b + 1); |
---|
| 1975 | reverse (F2, F2, b); |
---|
[0e2e23] | 1976 | |
---|
[81d96c] | 1977 | int d2= tmax (deg (F2)/d1, deg (F1)/d1); |
---|
| 1978 | return reverseSubstReciproFp (F1, F2, d1, d2); |
---|
[0e2e23] | 1979 | } |
---|
| 1980 | |
---|
[81d96c] | 1981 | //Kronecker substitution |
---|
[0e2e23] | 1982 | CanonicalForm |
---|
[81d96c] | 1983 | mulMod2NTLFp (const CanonicalForm& F, const CanonicalForm& G, const |
---|
| 1984 | CanonicalForm& M) |
---|
[0e2e23] | 1985 | { |
---|
| 1986 | CanonicalForm A= F; |
---|
| 1987 | CanonicalForm B= G; |
---|
| 1988 | |
---|
| 1989 | int degAx= degree (A, 1); |
---|
| 1990 | int degAy= degree (A, 2); |
---|
| 1991 | int degBx= degree (B, 1); |
---|
| 1992 | int degBy= degree (B, 2); |
---|
| 1993 | int d1= degAx + 1 + degBx; |
---|
| 1994 | int d2= tmax (degAy, degBy); |
---|
| 1995 | |
---|
| 1996 | if (d1 > 128 && d2 > 160 && (degAy == degBy) && (2*degAy > degree (M))) |
---|
[81d96c] | 1997 | return mulMod2NTLFpReci (A, B, M); |
---|
[0e2e23] | 1998 | |
---|
[81d96c] | 1999 | zz_pX NTLA= kronSubFp (A, d1); |
---|
| 2000 | zz_pX NTLB= kronSubFp (B, d1); |
---|
[0e2e23] | 2001 | |
---|
| 2002 | int k= d1*degree (M); |
---|
[81d96c] | 2003 | MulTrunc (NTLA, NTLA, NTLB, (long) k); |
---|
[0e2e23] | 2004 | |
---|
[81d96c] | 2005 | A= reverseSubstFp (NTLA, d1); |
---|
[0e2e23] | 2006 | |
---|
| 2007 | return A; |
---|
| 2008 | } |
---|
| 2009 | |
---|
[81d96c] | 2010 | // assumes input to be reduced mod M and to be an element of Fq not Fp |
---|
[0e2e23] | 2011 | CanonicalForm |
---|
[81d96c] | 2012 | mulMod2NTLFqReci (const CanonicalForm& F, const CanonicalForm& G, const |
---|
| 2013 | CanonicalForm& M, const Variable& alpha) |
---|
[0e2e23] | 2014 | { |
---|
[81d96c] | 2015 | int d1= degree (F, 1) + degree (G, 1) + 1; |
---|
[0e2e23] | 2016 | d1 /= 2; |
---|
| 2017 | d1 += 1; |
---|
| 2018 | |
---|
[81d96c] | 2019 | zz_pEX F1, F2; |
---|
| 2020 | kronSubReciproFq (F1, F2, F, d1, alpha); |
---|
| 2021 | zz_pEX G1, G2; |
---|
| 2022 | kronSubReciproFq (G1, G2, G, d1, alpha); |
---|
[0e2e23] | 2023 | |
---|
| 2024 | int k= d1*degree (M); |
---|
[81d96c] | 2025 | MulTrunc (F1, F1, G1, (long) k); |
---|
[0e2e23] | 2026 | |
---|
[81d96c] | 2027 | int degtailF= degree (tailcoeff (F), 1); |
---|
[0e2e23] | 2028 | int degtailG= degree (tailcoeff (G), 1); |
---|
| 2029 | int taildegF= taildegree (F); |
---|
| 2030 | int taildegG= taildegree (G); |
---|
[81d96c] | 2031 | int b= k + degtailF + degtailG - d1*(2+taildegF+taildegG); |
---|
[0e2e23] | 2032 | |
---|
[81d96c] | 2033 | reverse (F2, F2); |
---|
| 2034 | reverse (G2, G2); |
---|
| 2035 | MulTrunc (F2, F2, G2, b + 1); |
---|
| 2036 | reverse (F2, F2, b); |
---|
[0e2e23] | 2037 | |
---|
[81d96c] | 2038 | int d2= tmax (deg (F2)/d1, deg (F1)/d1); |
---|
| 2039 | return reverseSubstReciproFq (F1, F2, d1, d2, alpha); |
---|
[0e2e23] | 2040 | } |
---|
| 2041 | |
---|
[81d96c] | 2042 | #ifdef HAVE_FLINT |
---|
[0e2e23] | 2043 | CanonicalForm |
---|
[81d96c] | 2044 | mulMod2FLINTFp (const CanonicalForm& F, const CanonicalForm& G, const |
---|
| 2045 | CanonicalForm& M); |
---|
| 2046 | #endif |
---|
| 2047 | |
---|
| 2048 | CanonicalForm |
---|
| 2049 | mulMod2NTLFq (const CanonicalForm& F, const CanonicalForm& G, const |
---|
| 2050 | CanonicalForm& M) |
---|
[0e2e23] | 2051 | { |
---|
[81d96c] | 2052 | Variable alpha; |
---|
[0e2e23] | 2053 | CanonicalForm A= F; |
---|
| 2054 | CanonicalForm B= G; |
---|
| 2055 | |
---|
[81d96c] | 2056 | if (hasFirstAlgVar (A, alpha) || hasFirstAlgVar (B, alpha)) |
---|
| 2057 | { |
---|
| 2058 | int degAx= degree (A, 1); |
---|
| 2059 | int degAy= degree (A, 2); |
---|
| 2060 | int degBx= degree (B, 1); |
---|
| 2061 | int degBy= degree (B, 2); |
---|
| 2062 | int d1= degAx + degBx + 1; |
---|
| 2063 | int d2= tmax (degAy, degBy); |
---|
| 2064 | zz_p::init (getCharacteristic()); |
---|
| 2065 | zz_pX NTLMipo= convertFacCF2NTLzzpX (getMipo (alpha)); |
---|
| 2066 | zz_pE::init (NTLMipo); |
---|
[0e2e23] | 2067 | |
---|
[81d96c] | 2068 | int degMipo= degree (getMipo (alpha)); |
---|
| 2069 | if ((d1 > 128/degMipo) && (d2 > 160/degMipo) && (degAy == degBy) && |
---|
| 2070 | (2*degAy > degree (M))) |
---|
| 2071 | return mulMod2NTLFqReci (A, B, M, alpha); |
---|
[0e2e23] | 2072 | |
---|
[81d96c] | 2073 | zz_pEX NTLA= kronSubFq (A, d1, alpha); |
---|
| 2074 | zz_pEX NTLB= kronSubFq (B, d1, alpha); |
---|
[0e2e23] | 2075 | |
---|
[81d96c] | 2076 | int k= d1*degree (M); |
---|
| 2077 | |
---|
| 2078 | MulTrunc (NTLA, NTLA, NTLB, (long) k); |
---|
[0e2e23] | 2079 | |
---|
[81d96c] | 2080 | A= reverseSubstFq (NTLA, d1, alpha); |
---|
| 2081 | |
---|
| 2082 | return A; |
---|
| 2083 | } |
---|
| 2084 | else |
---|
| 2085 | #ifdef HAVE_FLINT |
---|
| 2086 | return mulMod2FLINTFp (A, B, M); |
---|
| 2087 | #else |
---|
| 2088 | return mulMod2NTLFp (A, B, M); |
---|
[0e2e23] | 2089 | #endif |
---|
[81d96c] | 2090 | } |
---|
[0e2e23] | 2091 | |
---|
| 2092 | CanonicalForm mulMod2 (const CanonicalForm& A, const CanonicalForm& B, |
---|
| 2093 | const CanonicalForm& M) |
---|
| 2094 | { |
---|
| 2095 | if (A.isZero() || B.isZero()) |
---|
| 2096 | return 0; |
---|
| 2097 | |
---|
| 2098 | ASSERT (M.isUnivariate(), "M must be univariate"); |
---|
| 2099 | |
---|
| 2100 | CanonicalForm F= mod (A, M); |
---|
| 2101 | CanonicalForm G= mod (B, M); |
---|
| 2102 | if (F.inCoeffDomain() || G.inCoeffDomain()) |
---|
| 2103 | return F*G; |
---|
| 2104 | Variable y= M.mvar(); |
---|
| 2105 | int degF= degree (F, y); |
---|
| 2106 | int degG= degree (G, y); |
---|
| 2107 | |
---|
| 2108 | if ((degF < 1 && degG < 1) && (F.isUnivariate() && G.isUnivariate()) && |
---|
| 2109 | (F.level() == G.level())) |
---|
| 2110 | { |
---|
| 2111 | CanonicalForm result= mulNTL (F, G); |
---|
| 2112 | return mod (result, M); |
---|
| 2113 | } |
---|
| 2114 | else if (degF <= 1 && degG <= 1) |
---|
| 2115 | { |
---|
| 2116 | CanonicalForm result= F*G; |
---|
| 2117 | return mod (result, M); |
---|
| 2118 | } |
---|
| 2119 | |
---|
| 2120 | int sizeF= size (F); |
---|
| 2121 | int sizeG= size (G); |
---|
| 2122 | |
---|
| 2123 | int fallBackToNaive= 50; |
---|
| 2124 | if (sizeF < fallBackToNaive || sizeG < fallBackToNaive) |
---|
| 2125 | return mod (F*G, M); |
---|
| 2126 | |
---|
| 2127 | #ifdef HAVE_FLINT |
---|
[67ed74] | 2128 | if (getCharacteristic() == 0) |
---|
| 2129 | return mulMod2FLINTQa (F, G, M); |
---|
[0e2e23] | 2130 | #endif |
---|
| 2131 | |
---|
| 2132 | if (getCharacteristic() > 0 && CFFactory::gettype() != GaloisFieldDomain && |
---|
| 2133 | (((degF-degG) < 50 && degF > degG) || ((degG-degF) < 50 && degF <= degG))) |
---|
| 2134 | return mulMod2NTLFq (F, G, M); |
---|
| 2135 | |
---|
| 2136 | int m= (int) ceil (degree (M)/2.0); |
---|
| 2137 | if (degF >= m || degG >= m) |
---|
| 2138 | { |
---|
| 2139 | CanonicalForm MLo= power (y, m); |
---|
| 2140 | CanonicalForm MHi= power (y, degree (M) - m); |
---|
| 2141 | CanonicalForm F0= mod (F, MLo); |
---|
| 2142 | CanonicalForm F1= div (F, MLo); |
---|
| 2143 | CanonicalForm G0= mod (G, MLo); |
---|
| 2144 | CanonicalForm G1= div (G, MLo); |
---|
| 2145 | CanonicalForm F0G1= mulMod2 (F0, G1, MHi); |
---|
| 2146 | CanonicalForm F1G0= mulMod2 (F1, G0, MHi); |
---|
| 2147 | CanonicalForm F0G0= mulMod2 (F0, G0, M); |
---|
| 2148 | return F0G0 + MLo*(F0G1 + F1G0); |
---|
| 2149 | } |
---|
| 2150 | else |
---|
| 2151 | { |
---|
| 2152 | m= (int) ceil (tmax (degF, degG)/2.0); |
---|
| 2153 | CanonicalForm yToM= power (y, m); |
---|
| 2154 | CanonicalForm F0= mod (F, yToM); |
---|
| 2155 | CanonicalForm F1= div (F, yToM); |
---|
| 2156 | CanonicalForm G0= mod (G, yToM); |
---|
| 2157 | CanonicalForm G1= div (G, yToM); |
---|
| 2158 | CanonicalForm H00= mulMod2 (F0, G0, M); |
---|
| 2159 | CanonicalForm H11= mulMod2 (F1, G1, M); |
---|
| 2160 | CanonicalForm H01= mulMod2 (F0 + F1, G0 + G1, M); |
---|
| 2161 | return H11*yToM*yToM + (H01 - H11 - H00)*yToM + H00; |
---|
| 2162 | } |
---|
| 2163 | DEBOUTLN (cerr, "fatal end in mulMod2"); |
---|
| 2164 | } |
---|
| 2165 | |
---|
[81d96c] | 2166 | // end bivariate polys |
---|
| 2167 | //********************** |
---|
| 2168 | // multivariate polys |
---|
| 2169 | |
---|
[0e2e23] | 2170 | CanonicalForm mod (const CanonicalForm& F, const CFList& M) |
---|
| 2171 | { |
---|
| 2172 | CanonicalForm A= F; |
---|
| 2173 | for (CFListIterator i= M; i.hasItem(); i++) |
---|
| 2174 | A= mod (A, i.getItem()); |
---|
| 2175 | return A; |
---|
| 2176 | } |
---|
| 2177 | |
---|
| 2178 | CanonicalForm mulMod (const CanonicalForm& A, const CanonicalForm& B, |
---|
| 2179 | const CFList& MOD) |
---|
| 2180 | { |
---|
| 2181 | if (A.isZero() || B.isZero()) |
---|
| 2182 | return 0; |
---|
| 2183 | |
---|
| 2184 | if (MOD.length() == 1) |
---|
| 2185 | return mulMod2 (A, B, MOD.getLast()); |
---|
| 2186 | |
---|
| 2187 | CanonicalForm M= MOD.getLast(); |
---|
| 2188 | CanonicalForm F= mod (A, M); |
---|
| 2189 | CanonicalForm G= mod (B, M); |
---|
| 2190 | if (F.inCoeffDomain() || G.inCoeffDomain()) |
---|
| 2191 | return F*G; |
---|
| 2192 | Variable y= M.mvar(); |
---|
| 2193 | int degF= degree (F, y); |
---|
| 2194 | int degG= degree (G, y); |
---|
| 2195 | |
---|
| 2196 | if ((degF <= 1 && F.level() <= M.level()) && |
---|
| 2197 | (degG <= 1 && G.level() <= M.level())) |
---|
| 2198 | { |
---|
| 2199 | CFList buf= MOD; |
---|
| 2200 | buf.removeLast(); |
---|
| 2201 | if (degF == 1 && degG == 1) |
---|
| 2202 | { |
---|
| 2203 | CanonicalForm F0= mod (F, y); |
---|
| 2204 | CanonicalForm F1= div (F, y); |
---|
| 2205 | CanonicalForm G0= mod (G, y); |
---|
| 2206 | CanonicalForm G1= div (G, y); |
---|
| 2207 | if (degree (M) > 2) |
---|
| 2208 | { |
---|
| 2209 | CanonicalForm H00= mulMod (F0, G0, buf); |
---|
| 2210 | CanonicalForm H11= mulMod (F1, G1, buf); |
---|
| 2211 | CanonicalForm H01= mulMod (F0 + F1, G0 + G1, buf); |
---|
| 2212 | return H11*y*y + (H01 - H00 - H11)*y + H00; |
---|
| 2213 | } |
---|
| 2214 | else //here degree (M) == 2 |
---|
| 2215 | { |
---|
| 2216 | buf.append (y); |
---|
| 2217 | CanonicalForm F0G1= mulMod (F0, G1, buf); |
---|
| 2218 | CanonicalForm F1G0= mulMod (F1, G0, buf); |
---|
| 2219 | CanonicalForm F0G0= mulMod (F0, G0, MOD); |
---|
| 2220 | CanonicalForm result= F0G0 + y*(F0G1 + F1G0); |
---|
| 2221 | return result; |
---|
| 2222 | } |
---|
| 2223 | } |
---|
| 2224 | else if (degF == 1 && degG == 0) |
---|
| 2225 | return mulMod (div (F, y), G, buf)*y + mulMod (mod (F, y), G, buf); |
---|
| 2226 | else if (degF == 0 && degG == 1) |
---|
| 2227 | return mulMod (div (G, y), F, buf)*y + mulMod (mod (G, y), F, buf); |
---|
| 2228 | else |
---|
| 2229 | return mulMod (F, G, buf); |
---|
| 2230 | } |
---|
| 2231 | int m= (int) ceil (degree (M)/2.0); |
---|
| 2232 | if (degF >= m || degG >= m) |
---|
| 2233 | { |
---|
| 2234 | CanonicalForm MLo= power (y, m); |
---|
| 2235 | CanonicalForm MHi= power (y, degree (M) - m); |
---|
| 2236 | CanonicalForm F0= mod (F, MLo); |
---|
| 2237 | CanonicalForm F1= div (F, MLo); |
---|
| 2238 | CanonicalForm G0= mod (G, MLo); |
---|
| 2239 | CanonicalForm G1= div (G, MLo); |
---|
| 2240 | CFList buf= MOD; |
---|
| 2241 | buf.removeLast(); |
---|
| 2242 | buf.append (MHi); |
---|
| 2243 | CanonicalForm F0G1= mulMod (F0, G1, buf); |
---|
| 2244 | CanonicalForm F1G0= mulMod (F1, G0, buf); |
---|
| 2245 | CanonicalForm F0G0= mulMod (F0, G0, MOD); |
---|
| 2246 | return F0G0 + MLo*(F0G1 + F1G0); |
---|
| 2247 | } |
---|
| 2248 | else |
---|
| 2249 | { |
---|
| 2250 | m= (int) ceil (tmax (degF, degG)/2.0); |
---|
| 2251 | CanonicalForm yToM= power (y, m); |
---|
| 2252 | CanonicalForm F0= mod (F, yToM); |
---|
| 2253 | CanonicalForm F1= div (F, yToM); |
---|
| 2254 | CanonicalForm G0= mod (G, yToM); |
---|
| 2255 | CanonicalForm G1= div (G, yToM); |
---|
| 2256 | CanonicalForm H00= mulMod (F0, G0, MOD); |
---|
| 2257 | CanonicalForm H11= mulMod (F1, G1, MOD); |
---|
| 2258 | CanonicalForm H01= mulMod (F0 + F1, G0 + G1, MOD); |
---|
| 2259 | return H11*yToM*yToM + (H01 - H11 - H00)*yToM + H00; |
---|
| 2260 | } |
---|
| 2261 | DEBOUTLN (cerr, "fatal end in mulMod"); |
---|
| 2262 | } |
---|
| 2263 | |
---|
| 2264 | CanonicalForm prodMod (const CFList& L, const CanonicalForm& M) |
---|
| 2265 | { |
---|
| 2266 | if (L.isEmpty()) |
---|
| 2267 | return 1; |
---|
| 2268 | int l= L.length(); |
---|
| 2269 | if (l == 1) |
---|
| 2270 | return mod (L.getFirst(), M); |
---|
| 2271 | else if (l == 2) { |
---|
| 2272 | CanonicalForm result= mulMod2 (L.getFirst(), L.getLast(), M); |
---|
| 2273 | return result; |
---|
| 2274 | } |
---|
| 2275 | else |
---|
| 2276 | { |
---|
| 2277 | l /= 2; |
---|
| 2278 | CFList tmp1, tmp2; |
---|
| 2279 | CFListIterator i= L; |
---|
| 2280 | CanonicalForm buf1, buf2; |
---|
| 2281 | for (int j= 1; j <= l; j++, i++) |
---|
| 2282 | tmp1.append (i.getItem()); |
---|
| 2283 | tmp2= Difference (L, tmp1); |
---|
| 2284 | buf1= prodMod (tmp1, M); |
---|
| 2285 | buf2= prodMod (tmp2, M); |
---|
| 2286 | CanonicalForm result= mulMod2 (buf1, buf2, M); |
---|
| 2287 | return result; |
---|
| 2288 | } |
---|
| 2289 | } |
---|
| 2290 | |
---|
| 2291 | CanonicalForm prodMod (const CFList& L, const CFList& M) |
---|
| 2292 | { |
---|
| 2293 | if (L.isEmpty()) |
---|
| 2294 | return 1; |
---|
| 2295 | else if (L.length() == 1) |
---|
| 2296 | return L.getFirst(); |
---|
| 2297 | else if (L.length() == 2) |
---|
| 2298 | return mulMod (L.getFirst(), L.getLast(), M); |
---|
| 2299 | else |
---|
| 2300 | { |
---|
| 2301 | int l= L.length()/2; |
---|
| 2302 | CFListIterator i= L; |
---|
| 2303 | CFList tmp1, tmp2; |
---|
| 2304 | CanonicalForm buf1, buf2; |
---|
| 2305 | for (int j= 1; j <= l; j++, i++) |
---|
| 2306 | tmp1.append (i.getItem()); |
---|
| 2307 | tmp2= Difference (L, tmp1); |
---|
| 2308 | buf1= prodMod (tmp1, M); |
---|
| 2309 | buf2= prodMod (tmp2, M); |
---|
| 2310 | return mulMod (buf1, buf2, M); |
---|
| 2311 | } |
---|
| 2312 | } |
---|
| 2313 | |
---|
[81d96c] | 2314 | // end multivariate polys |
---|
| 2315 | //*************************** |
---|
| 2316 | // division |
---|
| 2317 | |
---|
[0e2e23] | 2318 | CanonicalForm reverse (const CanonicalForm& F, int d) |
---|
| 2319 | { |
---|
| 2320 | if (d == 0) |
---|
| 2321 | return F; |
---|
| 2322 | CanonicalForm A= F; |
---|
| 2323 | Variable y= Variable (2); |
---|
| 2324 | Variable x= Variable (1); |
---|
| 2325 | if (degree (A, x) > 0) |
---|
| 2326 | { |
---|
| 2327 | A= swapvar (A, x, y); |
---|
| 2328 | CanonicalForm result= 0; |
---|
| 2329 | CFIterator i= A; |
---|
| 2330 | while (d - i.exp() < 0) |
---|
| 2331 | i++; |
---|
| 2332 | |
---|
| 2333 | for (; i.hasTerms() && (d - i.exp() >= 0); i++) |
---|
| 2334 | result += swapvar (i.coeff(),x,y)*power (x, d - i.exp()); |
---|
| 2335 | return result; |
---|
| 2336 | } |
---|
| 2337 | else |
---|
| 2338 | return A*power (x, d); |
---|
| 2339 | } |
---|
| 2340 | |
---|
| 2341 | CanonicalForm |
---|
| 2342 | newtonInverse (const CanonicalForm& F, const int n, const CanonicalForm& M) |
---|
| 2343 | { |
---|
| 2344 | int l= ilog2(n); |
---|
| 2345 | |
---|
| 2346 | CanonicalForm g= mod (F, M)[0] [0]; |
---|
| 2347 | |
---|
| 2348 | ASSERT (!g.isZero(), "expected a unit"); |
---|
| 2349 | |
---|
| 2350 | Variable alpha; |
---|
| 2351 | |
---|
| 2352 | if (!g.isOne()) |
---|
| 2353 | g = 1/g; |
---|
| 2354 | Variable x= Variable (1); |
---|
| 2355 | CanonicalForm result; |
---|
| 2356 | int exp= 0; |
---|
| 2357 | if (n & 1) |
---|
| 2358 | { |
---|
| 2359 | result= g; |
---|
| 2360 | exp= 1; |
---|
| 2361 | } |
---|
| 2362 | CanonicalForm h; |
---|
| 2363 | |
---|
| 2364 | for (int i= 1; i <= l; i++) |
---|
| 2365 | { |
---|
| 2366 | h= mulMod2 (g, mod (F, power (x, (1 << i))), M); |
---|
| 2367 | h= mod (h, power (x, (1 << i)) - 1); |
---|
| 2368 | h= div (h, power (x, (1 << (i - 1)))); |
---|
| 2369 | h= mod (h, M); |
---|
| 2370 | g -= power (x, (1 << (i - 1)))* |
---|
| 2371 | mod (mulMod2 (g, h, M), power (x, (1 << (i - 1)))); |
---|
| 2372 | |
---|
| 2373 | if (n & (1 << i)) |
---|
| 2374 | { |
---|
| 2375 | if (exp) |
---|
| 2376 | { |
---|
| 2377 | h= mulMod2 (result, mod (F, power (x, exp + (1 << i))), M); |
---|
| 2378 | h= mod (h, power (x, exp + (1 << i)) - 1); |
---|
| 2379 | h= div (h, power (x, exp)); |
---|
| 2380 | h= mod (h, M); |
---|
| 2381 | result -= power(x, exp)*mod (mulMod2 (g, h, M), |
---|
| 2382 | power (x, (1 << i))); |
---|
| 2383 | exp += (1 << i); |
---|
| 2384 | } |
---|
| 2385 | else |
---|
| 2386 | { |
---|
| 2387 | exp= (1 << i); |
---|
| 2388 | result= g; |
---|
| 2389 | } |
---|
| 2390 | } |
---|
| 2391 | } |
---|
| 2392 | |
---|
| 2393 | return result; |
---|
| 2394 | } |
---|
| 2395 | |
---|
| 2396 | CanonicalForm |
---|
| 2397 | newtonDiv (const CanonicalForm& F, const CanonicalForm& G, const CanonicalForm& |
---|
| 2398 | M) |
---|
| 2399 | { |
---|
| 2400 | ASSERT (getCharacteristic() > 0, "positive characteristic expected"); |
---|
| 2401 | ASSERT (CFFactory::gettype() != GaloisFieldDomain, "no GF expected"); |
---|
| 2402 | |
---|
| 2403 | CanonicalForm A= mod (F, M); |
---|
| 2404 | CanonicalForm B= mod (G, M); |
---|
| 2405 | |
---|
| 2406 | Variable x= Variable (1); |
---|
| 2407 | int degA= degree (A, x); |
---|
| 2408 | int degB= degree (B, x); |
---|
| 2409 | int m= degA - degB; |
---|
| 2410 | if (m < 0) |
---|
| 2411 | return 0; |
---|
| 2412 | |
---|
| 2413 | Variable v; |
---|
| 2414 | CanonicalForm Q; |
---|
| 2415 | if (degB < 1 || CFFactory::gettype() == GaloisFieldDomain) |
---|
| 2416 | { |
---|
| 2417 | CanonicalForm R; |
---|
| 2418 | divrem2 (A, B, Q, R, M); |
---|
| 2419 | } |
---|
| 2420 | else |
---|
| 2421 | { |
---|
| 2422 | if (hasFirstAlgVar (A, v) || hasFirstAlgVar (B, v)) |
---|
| 2423 | { |
---|
| 2424 | CanonicalForm R= reverse (A, degA); |
---|
| 2425 | CanonicalForm revB= reverse (B, degB); |
---|
| 2426 | revB= newtonInverse (revB, m + 1, M); |
---|
| 2427 | Q= mulMod2 (R, revB, M); |
---|
| 2428 | Q= mod (Q, power (x, m + 1)); |
---|
| 2429 | Q= reverse (Q, m); |
---|
| 2430 | } |
---|
| 2431 | else |
---|
| 2432 | { |
---|
| 2433 | zz_pX mipo= convertFacCF2NTLzzpX (M); |
---|
| 2434 | Variable y= Variable (2); |
---|
| 2435 | zz_pEX NTLA, NTLB; |
---|
| 2436 | NTLA= convertFacCF2NTLzz_pEX (swapvar (A, x, y), mipo); |
---|
| 2437 | NTLB= convertFacCF2NTLzz_pEX (swapvar (B, x, y), mipo); |
---|
| 2438 | div (NTLA, NTLA, NTLB); |
---|
| 2439 | Q= convertNTLzz_pEX2CF (NTLA, x, y); |
---|
| 2440 | } |
---|
| 2441 | } |
---|
| 2442 | |
---|
| 2443 | return Q; |
---|
| 2444 | } |
---|
| 2445 | |
---|
| 2446 | void |
---|
| 2447 | newtonDivrem (const CanonicalForm& F, const CanonicalForm& G, CanonicalForm& Q, |
---|
| 2448 | CanonicalForm& R, const CanonicalForm& M) |
---|
| 2449 | { |
---|
| 2450 | CanonicalForm A= mod (F, M); |
---|
| 2451 | CanonicalForm B= mod (G, M); |
---|
| 2452 | Variable x= Variable (1); |
---|
| 2453 | int degA= degree (A, x); |
---|
| 2454 | int degB= degree (B, x); |
---|
| 2455 | int m= degA - degB; |
---|
| 2456 | |
---|
| 2457 | if (m < 0) |
---|
| 2458 | { |
---|
| 2459 | R= A; |
---|
| 2460 | Q= 0; |
---|
| 2461 | return; |
---|
| 2462 | } |
---|
| 2463 | |
---|
| 2464 | Variable v; |
---|
| 2465 | if (degB <= 1 || CFFactory::gettype() == GaloisFieldDomain) |
---|
| 2466 | { |
---|
| 2467 | divrem2 (A, B, Q, R, M); |
---|
| 2468 | } |
---|
| 2469 | else |
---|
| 2470 | { |
---|
| 2471 | if (hasFirstAlgVar (A, v) || hasFirstAlgVar (B, v)) |
---|
| 2472 | { |
---|
| 2473 | R= reverse (A, degA); |
---|
| 2474 | |
---|
| 2475 | CanonicalForm revB= reverse (B, degB); |
---|
| 2476 | revB= newtonInverse (revB, m + 1, M); |
---|
| 2477 | Q= mulMod2 (R, revB, M); |
---|
| 2478 | |
---|
| 2479 | Q= mod (Q, power (x, m + 1)); |
---|
| 2480 | Q= reverse (Q, m); |
---|
| 2481 | |
---|
| 2482 | R= A - mulMod2 (Q, B, M); |
---|
| 2483 | } |
---|
| 2484 | else |
---|
| 2485 | { |
---|
| 2486 | zz_pX mipo= convertFacCF2NTLzzpX (M); |
---|
| 2487 | Variable y= Variable (2); |
---|
| 2488 | zz_pEX NTLA, NTLB; |
---|
| 2489 | NTLA= convertFacCF2NTLzz_pEX (swapvar (A, x, y), mipo); |
---|
| 2490 | NTLB= convertFacCF2NTLzz_pEX (swapvar (B, x, y), mipo); |
---|
| 2491 | zz_pEX NTLQ, NTLR; |
---|
| 2492 | DivRem (NTLQ, NTLR, NTLA, NTLB); |
---|
| 2493 | Q= convertNTLzz_pEX2CF (NTLQ, x, y); |
---|
| 2494 | R= convertNTLzz_pEX2CF (NTLR, x, y); |
---|
| 2495 | } |
---|
| 2496 | } |
---|
| 2497 | } |
---|
| 2498 | |
---|
| 2499 | static inline |
---|
| 2500 | CFList split (const CanonicalForm& F, const int m, const Variable& x) |
---|
| 2501 | { |
---|
| 2502 | CanonicalForm A= F; |
---|
| 2503 | CanonicalForm buf= 0; |
---|
| 2504 | bool swap= false; |
---|
| 2505 | if (degree (A, x) <= 0) |
---|
| 2506 | return CFList(A); |
---|
| 2507 | else if (x.level() != A.level()) |
---|
| 2508 | { |
---|
| 2509 | swap= true; |
---|
| 2510 | A= swapvar (A, x, A.mvar()); |
---|
| 2511 | } |
---|
| 2512 | |
---|
| 2513 | int j= (int) floor ((double) degree (A)/ m); |
---|
| 2514 | CFList result; |
---|
| 2515 | CFIterator i= A; |
---|
| 2516 | for (; j >= 0; j--) |
---|
| 2517 | { |
---|
| 2518 | while (i.hasTerms() && i.exp() - j*m >= 0) |
---|
| 2519 | { |
---|
| 2520 | if (swap) |
---|
| 2521 | buf += i.coeff()*power (A.mvar(), i.exp() - j*m); |
---|
| 2522 | else |
---|
| 2523 | buf += i.coeff()*power (x, i.exp() - j*m); |
---|
| 2524 | i++; |
---|
| 2525 | } |
---|
| 2526 | if (swap) |
---|
| 2527 | result.append (swapvar (buf, x, F.mvar())); |
---|
| 2528 | else |
---|
| 2529 | result.append (buf); |
---|
| 2530 | buf= 0; |
---|
| 2531 | } |
---|
| 2532 | return result; |
---|
| 2533 | } |
---|
| 2534 | |
---|
| 2535 | static inline |
---|
| 2536 | void divrem32 (const CanonicalForm& F, const CanonicalForm& G, CanonicalForm& Q, |
---|
| 2537 | CanonicalForm& R, const CFList& M); |
---|
| 2538 | |
---|
| 2539 | static inline |
---|
| 2540 | void divrem21 (const CanonicalForm& F, const CanonicalForm& G, CanonicalForm& Q, |
---|
| 2541 | CanonicalForm& R, const CFList& M) |
---|
| 2542 | { |
---|
| 2543 | CanonicalForm A= mod (F, M); |
---|
| 2544 | CanonicalForm B= mod (G, M); |
---|
| 2545 | Variable x= Variable (1); |
---|
| 2546 | int degB= degree (B, x); |
---|
| 2547 | int degA= degree (A, x); |
---|
| 2548 | if (degA < degB) |
---|
| 2549 | { |
---|
| 2550 | Q= 0; |
---|
| 2551 | R= A; |
---|
| 2552 | return; |
---|
| 2553 | } |
---|
| 2554 | ASSERT (2*degB > degA, "expected degree (F, 1) < 2*degree (G, 1)"); |
---|
| 2555 | if (degB < 1) |
---|
| 2556 | { |
---|
| 2557 | divrem (A, B, Q, R); |
---|
| 2558 | Q= mod (Q, M); |
---|
| 2559 | R= mod (R, M); |
---|
| 2560 | return; |
---|
| 2561 | } |
---|
| 2562 | |
---|
| 2563 | int m= (int) ceil ((double) (degB + 1)/2.0) + 1; |
---|
| 2564 | CFList splitA= split (A, m, x); |
---|
| 2565 | if (splitA.length() == 3) |
---|
| 2566 | splitA.insert (0); |
---|
| 2567 | if (splitA.length() == 2) |
---|
| 2568 | { |
---|
| 2569 | splitA.insert (0); |
---|
| 2570 | splitA.insert (0); |
---|
| 2571 | } |
---|
| 2572 | if (splitA.length() == 1) |
---|
| 2573 | { |
---|
| 2574 | splitA.insert (0); |
---|
| 2575 | splitA.insert (0); |
---|
| 2576 | splitA.insert (0); |
---|
| 2577 | } |
---|
| 2578 | |
---|
| 2579 | CanonicalForm xToM= power (x, m); |
---|
| 2580 | |
---|
| 2581 | CFListIterator i= splitA; |
---|
| 2582 | CanonicalForm H= i.getItem(); |
---|
| 2583 | i++; |
---|
| 2584 | H *= xToM; |
---|
| 2585 | H += i.getItem(); |
---|
| 2586 | i++; |
---|
| 2587 | H *= xToM; |
---|
| 2588 | H += i.getItem(); |
---|
| 2589 | i++; |
---|
| 2590 | |
---|
| 2591 | divrem32 (H, B, Q, R, M); |
---|
| 2592 | |
---|
| 2593 | CFList splitR= split (R, m, x); |
---|
| 2594 | if (splitR.length() == 1) |
---|
| 2595 | splitR.insert (0); |
---|
| 2596 | |
---|
| 2597 | H= splitR.getFirst(); |
---|
| 2598 | H *= xToM; |
---|
| 2599 | H += splitR.getLast(); |
---|
| 2600 | H *= xToM; |
---|
| 2601 | H += i.getItem(); |
---|
| 2602 | |
---|
| 2603 | CanonicalForm bufQ; |
---|
| 2604 | divrem32 (H, B, bufQ, R, M); |
---|
| 2605 | |
---|
| 2606 | Q *= xToM; |
---|
| 2607 | Q += bufQ; |
---|
| 2608 | return; |
---|
| 2609 | } |
---|
| 2610 | |
---|
| 2611 | static inline |
---|
| 2612 | void divrem32 (const CanonicalForm& F, const CanonicalForm& G, CanonicalForm& Q, |
---|
| 2613 | CanonicalForm& R, const CFList& M) |
---|
| 2614 | { |
---|
| 2615 | CanonicalForm A= mod (F, M); |
---|
| 2616 | CanonicalForm B= mod (G, M); |
---|
| 2617 | Variable x= Variable (1); |
---|
| 2618 | int degB= degree (B, x); |
---|
| 2619 | int degA= degree (A, x); |
---|
| 2620 | if (degA < degB) |
---|
| 2621 | { |
---|
| 2622 | Q= 0; |
---|
| 2623 | R= A; |
---|
| 2624 | return; |
---|
| 2625 | } |
---|
| 2626 | ASSERT (3*(degB/2) > degA, "expected degree (F, 1) < 3*(degree (G, 1)/2)"); |
---|
| 2627 | if (degB < 1) |
---|
| 2628 | { |
---|
| 2629 | divrem (A, B, Q, R); |
---|
| 2630 | Q= mod (Q, M); |
---|
| 2631 | R= mod (R, M); |
---|
| 2632 | return; |
---|
| 2633 | } |
---|
| 2634 | int m= (int) ceil ((double) (degB + 1)/ 2.0); |
---|
| 2635 | |
---|
| 2636 | CFList splitA= split (A, m, x); |
---|
| 2637 | CFList splitB= split (B, m, x); |
---|
| 2638 | |
---|
| 2639 | if (splitA.length() == 2) |
---|
| 2640 | { |
---|
| 2641 | splitA.insert (0); |
---|
| 2642 | } |
---|
| 2643 | if (splitA.length() == 1) |
---|
| 2644 | { |
---|
| 2645 | splitA.insert (0); |
---|
| 2646 | splitA.insert (0); |
---|
| 2647 | } |
---|
| 2648 | CanonicalForm xToM= power (x, m); |
---|
| 2649 | |
---|
| 2650 | CanonicalForm H; |
---|
| 2651 | CFListIterator i= splitA; |
---|
| 2652 | i++; |
---|
| 2653 | |
---|
| 2654 | if (degree (splitA.getFirst(), x) < degree (splitB.getFirst(), x)) |
---|
| 2655 | { |
---|
| 2656 | H= splitA.getFirst()*xToM + i.getItem(); |
---|
| 2657 | divrem21 (H, splitB.getFirst(), Q, R, M); |
---|
| 2658 | } |
---|
| 2659 | else |
---|
| 2660 | { |
---|
| 2661 | R= splitA.getFirst()*xToM + i.getItem() + splitB.getFirst() - |
---|
| 2662 | splitB.getFirst()*xToM; |
---|
| 2663 | Q= xToM - 1; |
---|
| 2664 | } |
---|
| 2665 | |
---|
| 2666 | H= mulMod (Q, splitB.getLast(), M); |
---|
| 2667 | |
---|
| 2668 | R= R*xToM + splitA.getLast() - H; |
---|
| 2669 | |
---|
| 2670 | while (degree (R, x) >= degB) |
---|
| 2671 | { |
---|
| 2672 | xToM= power (x, degree (R, x) - degB); |
---|
| 2673 | Q += LC (R, x)*xToM; |
---|
| 2674 | R -= mulMod (LC (R, x), B, M)*xToM; |
---|
| 2675 | Q= mod (Q, M); |
---|
| 2676 | R= mod (R, M); |
---|
| 2677 | } |
---|
| 2678 | |
---|
| 2679 | return; |
---|
| 2680 | } |
---|
| 2681 | |
---|
| 2682 | void divrem2 (const CanonicalForm& F, const CanonicalForm& G, CanonicalForm& Q, |
---|
| 2683 | CanonicalForm& R, const CanonicalForm& M) |
---|
| 2684 | { |
---|
| 2685 | CanonicalForm A= mod (F, M); |
---|
| 2686 | CanonicalForm B= mod (G, M); |
---|
| 2687 | |
---|
| 2688 | if (B.inCoeffDomain()) |
---|
| 2689 | { |
---|
| 2690 | divrem (A, B, Q, R); |
---|
| 2691 | return; |
---|
| 2692 | } |
---|
| 2693 | if (A.inCoeffDomain() && !B.inCoeffDomain()) |
---|
| 2694 | { |
---|
| 2695 | Q= 0; |
---|
| 2696 | R= A; |
---|
| 2697 | return; |
---|
| 2698 | } |
---|
| 2699 | |
---|
| 2700 | if (B.level() < A.level()) |
---|
| 2701 | { |
---|
| 2702 | divrem (A, B, Q, R); |
---|
| 2703 | return; |
---|
| 2704 | } |
---|
| 2705 | if (A.level() > B.level()) |
---|
| 2706 | { |
---|
| 2707 | R= A; |
---|
| 2708 | Q= 0; |
---|
| 2709 | return; |
---|
| 2710 | } |
---|
| 2711 | if (B.level() == 1 && B.isUnivariate()) |
---|
| 2712 | { |
---|
| 2713 | divrem (A, B, Q, R); |
---|
| 2714 | return; |
---|
| 2715 | } |
---|
[e016ba] | 2716 | if (!(B.level() == 1 && B.isUnivariate()) && |
---|
| 2717 | (A.level() == 1 && A.isUnivariate())) |
---|
[0e2e23] | 2718 | { |
---|
| 2719 | Q= 0; |
---|
| 2720 | R= A; |
---|
| 2721 | return; |
---|
| 2722 | } |
---|
| 2723 | |
---|
| 2724 | Variable x= Variable (1); |
---|
| 2725 | int degB= degree (B, x); |
---|
| 2726 | if (degB > degree (A, x)) |
---|
| 2727 | { |
---|
| 2728 | Q= 0; |
---|
| 2729 | R= A; |
---|
| 2730 | return; |
---|
| 2731 | } |
---|
| 2732 | |
---|
| 2733 | CFList splitA= split (A, degB, x); |
---|
| 2734 | |
---|
| 2735 | CanonicalForm xToDegB= power (x, degB); |
---|
| 2736 | CanonicalForm H, bufQ; |
---|
| 2737 | Q= 0; |
---|
| 2738 | CFListIterator i= splitA; |
---|
| 2739 | H= i.getItem()*xToDegB; |
---|
| 2740 | i++; |
---|
| 2741 | H += i.getItem(); |
---|
| 2742 | CFList buf; |
---|
| 2743 | while (i.hasItem()) |
---|
| 2744 | { |
---|
| 2745 | buf= CFList (M); |
---|
| 2746 | divrem21 (H, B, bufQ, R, buf); |
---|
| 2747 | i++; |
---|
| 2748 | if (i.hasItem()) |
---|
| 2749 | H= R*xToDegB + i.getItem(); |
---|
| 2750 | Q *= xToDegB; |
---|
| 2751 | Q += bufQ; |
---|
| 2752 | } |
---|
| 2753 | return; |
---|
| 2754 | } |
---|
| 2755 | |
---|
| 2756 | void divrem (const CanonicalForm& F, const CanonicalForm& G, CanonicalForm& Q, |
---|
| 2757 | CanonicalForm& R, const CFList& MOD) |
---|
| 2758 | { |
---|
| 2759 | CanonicalForm A= mod (F, MOD); |
---|
| 2760 | CanonicalForm B= mod (G, MOD); |
---|
| 2761 | Variable x= Variable (1); |
---|
| 2762 | int degB= degree (B, x); |
---|
| 2763 | if (degB > degree (A, x)) |
---|
| 2764 | { |
---|
| 2765 | Q= 0; |
---|
| 2766 | R= A; |
---|
| 2767 | return; |
---|
| 2768 | } |
---|
| 2769 | |
---|
| 2770 | if (degB <= 0) |
---|
| 2771 | { |
---|
| 2772 | divrem (A, B, Q, R); |
---|
| 2773 | Q= mod (Q, MOD); |
---|
| 2774 | R= mod (R, MOD); |
---|
| 2775 | return; |
---|
| 2776 | } |
---|
| 2777 | CFList splitA= split (A, degB, x); |
---|
| 2778 | |
---|
| 2779 | CanonicalForm xToDegB= power (x, degB); |
---|
| 2780 | CanonicalForm H, bufQ; |
---|
| 2781 | Q= 0; |
---|
| 2782 | CFListIterator i= splitA; |
---|
| 2783 | H= i.getItem()*xToDegB; |
---|
| 2784 | i++; |
---|
| 2785 | H += i.getItem(); |
---|
| 2786 | while (i.hasItem()) |
---|
| 2787 | { |
---|
| 2788 | divrem21 (H, B, bufQ, R, MOD); |
---|
| 2789 | i++; |
---|
| 2790 | if (i.hasItem()) |
---|
| 2791 | H= R*xToDegB + i.getItem(); |
---|
| 2792 | Q *= xToDegB; |
---|
| 2793 | Q += bufQ; |
---|
| 2794 | } |
---|
| 2795 | return; |
---|
| 2796 | } |
---|
| 2797 | |
---|
[c7c7fe4] | 2798 | bool |
---|
| 2799 | uniFdivides (const CanonicalForm& A, const CanonicalForm& B) |
---|
| 2800 | { |
---|
| 2801 | int p= getCharacteristic(); |
---|
| 2802 | if (p > 0) |
---|
| 2803 | { |
---|
| 2804 | zz_p::init (p); |
---|
| 2805 | Variable alpha; |
---|
| 2806 | if (hasFirstAlgVar (A, alpha) || hasFirstAlgVar (B, alpha)) |
---|
| 2807 | { |
---|
| 2808 | zz_pX NTLMipo= convertFacCF2NTLzzpX (getMipo (alpha)); |
---|
| 2809 | zz_pE::init (NTLMipo); |
---|
| 2810 | zz_pEX NTLA= convertFacCF2NTLzz_pEX (A, NTLMipo); |
---|
| 2811 | zz_pEX NTLB= convertFacCF2NTLzz_pEX (B, NTLMipo); |
---|
| 2812 | return divide (NTLB, NTLA); |
---|
| 2813 | } |
---|
| 2814 | #ifdef HAVE_FLINT |
---|
| 2815 | nmod_poly_t FLINTA, FLINTB; |
---|
| 2816 | convertFacCF2nmod_poly_t (FLINTA, A); |
---|
| 2817 | convertFacCF2nmod_poly_t (FLINTB, B); |
---|
| 2818 | nmod_poly_rem (FLINTA, FLINTB, FLINTA); |
---|
| 2819 | bool result= nmod_poly_is_zero (FLINTA); |
---|
| 2820 | nmod_poly_clear (FLINTA); |
---|
| 2821 | nmod_poly_clear (FLINTB); |
---|
| 2822 | return result; |
---|
| 2823 | #else |
---|
| 2824 | zz_pX NTLA= convertFacCF2NTLzzpX (A); |
---|
| 2825 | zz_pX NTLB= convertFacCF2NTLzzpX (B); |
---|
| 2826 | return divide (NTLB, NTLA); |
---|
| 2827 | #endif |
---|
| 2828 | } |
---|
| 2829 | #ifdef HAVE_FLINT |
---|
[e451f48] | 2830 | Variable alpha; |
---|
| 2831 | if (!hasFirstAlgVar (A, alpha) && !hasFirstAlgVar (B, alpha)) |
---|
| 2832 | { |
---|
| 2833 | fmpq_poly_t FLINTA,FLINTB; |
---|
| 2834 | fmpq_poly_init (FLINTA); |
---|
| 2835 | fmpq_poly_init (FLINTB); |
---|
| 2836 | convertFacCF2Fmpq_poly_t (FLINTA, A); |
---|
| 2837 | convertFacCF2Fmpq_poly_t (FLINTB, B); |
---|
| 2838 | fmpq_poly_rem (FLINTA, FLINTB, FLINTA); |
---|
| 2839 | bool result= fmpq_poly_is_zero (FLINTA); |
---|
| 2840 | fmpq_poly_clear (FLINTA); |
---|
| 2841 | fmpq_poly_clear (FLINTB); |
---|
| 2842 | return result; |
---|
| 2843 | } |
---|
[f89fed] | 2844 | else |
---|
[42af505] | 2845 | return true; |
---|
| 2846 | //return fdivides (A, B); |
---|
[c7c7fe4] | 2847 | #else |
---|
| 2848 | return fdivides (A, B); //maybe NTL? |
---|
| 2849 | #endif |
---|
| 2850 | } |
---|
| 2851 | |
---|
[81d96c] | 2852 | // end division |
---|
| 2853 | |
---|
[0e2e23] | 2854 | #endif |
---|