[3a67ea7] | 1 | /**************************************** |
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| 2 | * Computer Algebra System SINGULAR * |
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| 3 | ****************************************/ |
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[dabe365] | 4 | /* $Id: shiftgb.cc,v 1.10 2008-08-07 18:08:37 levandov Exp $ */ |
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[3a67ea7] | 5 | /* |
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| 6 | * ABSTRACT: kernel: utils for shift GB and free GB |
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| 7 | */ |
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| 8 | |
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[cb0fbe] | 9 | #include "mod2.h" |
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[07625cb] | 10 | |
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[037df4] | 11 | #ifdef HAVE_SHIFTBBA |
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[cb0fbe] | 12 | #include "febase.h" |
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| 13 | #include "ring.h" |
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| 14 | #include "polys.h" |
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| 15 | #include "numbers.h" |
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| 16 | #include "ideals.h" |
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| 17 | #include "matpol.h" |
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| 18 | #include "kbuckets.h" |
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| 19 | #include "kstd1.h" |
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| 20 | #include "sbuckets.h" |
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| 21 | #include "p_Mult_q.h" |
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| 22 | #include "kutil.h" |
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| 23 | #include "structs.h" |
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| 24 | #include "omalloc.h" |
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| 25 | #include "khstd.h" |
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| 26 | #include "kbuckets.h" |
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| 27 | #include "weight.h" |
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| 28 | #include "intvec.h" |
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| 29 | #include "structs.h" |
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| 30 | #include "kInline.cc" |
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| 31 | #include "stairc.h" |
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| 32 | #include "weight.h" |
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| 33 | #include "intvec.h" |
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| 34 | #include "timer.h" |
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| 35 | #include "shiftgb.h" |
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| 36 | #include "sca.h" |
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| 37 | |
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| 38 | |
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| 39 | #define freeT(A,v) omFreeSize((ADDRESS)A,(v+1)*sizeof(int)) |
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[3a67ea7] | 40 | |
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[4d2ab5c] | 41 | |
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| 42 | /* TODO: write p* stuff as instances of p_* for all the functions */ |
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[ad1c3b] | 43 | /* p_* functions are new, p* are old */ |
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[4d2ab5c] | 44 | |
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| 45 | poly p_LPshiftT(poly p, int sh, int uptodeg, int lV, kStrategy strat, const ring r) |
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| 46 | { |
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| 47 | /* assume shift takes place, shifts the poly p by sh */ |
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| 48 | /* p is like TObject: lm in currRing = r, tail in tailRing */ |
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| 49 | |
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| 50 | if (p==NULL) return(p); |
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| 51 | |
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| 52 | assume(p_LmCheckIsFromRing(p,r)); |
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| 53 | assume(p_CheckIsFromRing(pNext(p),strat->tailRing)); |
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| 54 | |
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[ad1c3b] | 55 | /* assume sh and uptodeg agree TODO check */ |
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[4d2ab5c] | 56 | |
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| 57 | if (sh == 0) return(p); /* the zero shift */ |
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| 58 | |
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| 59 | poly q = NULL; |
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| 60 | poly s = p_mLPshift(p, sh, uptodeg, lV, r); // lm in currRing |
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| 61 | poly pp = pNext(p); |
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| 62 | |
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| 63 | while (pp != NULL) |
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| 64 | { |
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| 65 | q = p_Add_q(q, p_mLPshift(pp,sh,uptodeg,lV,strat->tailRing),strat->tailRing); |
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| 66 | pIter(pp); |
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| 67 | } |
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| 68 | pNext(s) = q; |
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| 69 | /* int version: returns TRUE if it was successful */ |
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| 70 | return(s); |
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| 71 | } |
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| 72 | |
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| 73 | |
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| 74 | poly p_LPshift(poly p, int sh, int uptodeg, int lV, const ring r) |
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| 75 | { |
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| 76 | /* assume shift takes place */ |
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[ad1c3b] | 77 | /* shifts the poly p from the ring r by sh */ |
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[4d2ab5c] | 78 | |
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[ad1c3b] | 79 | /* assume sh and uptodeg agree TODO check */ |
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[4d2ab5c] | 80 | |
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| 81 | if (p==NULL) return(p); |
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| 82 | if (sh == 0) return(p); /* the zero shift */ |
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| 83 | |
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| 84 | poly q = NULL; |
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[ad1c3b] | 85 | poly pp = p; // do not take copies |
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[4d2ab5c] | 86 | while (pp!=NULL) |
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| 87 | { |
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| 88 | q = p_Add_q(q, p_mLPshift(pp,sh,uptodeg,lV,r),r); |
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| 89 | pIter(pp); |
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| 90 | } |
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| 91 | return(q); |
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| 92 | } |
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| 93 | |
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| 94 | poly p_mLPshift(poly p, int sh, int uptodeg, int lV, const ring r) |
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| 95 | { |
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[ad1c3b] | 96 | /* p is a monomial from the ring r */ |
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[4d2ab5c] | 97 | |
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| 98 | if (sh == 0) return(p); /* the zero shift */ |
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| 99 | |
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| 100 | if (sh < 0 ) |
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| 101 | { |
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| 102 | #ifdef PDEBUG |
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| 103 | Print("pmLPshift: negative shift requested"); |
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| 104 | #endif |
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| 105 | return(NULL); /* violation, 2check */ |
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| 106 | } |
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| 107 | |
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| 108 | int L = p_mLastVblock(p,lV,r); |
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| 109 | if (L+sh-1 > uptodeg) |
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| 110 | { |
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| 111 | #ifdef PDEBUG |
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| 112 | Print("p_mLPshift: too big shift requested"); |
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| 113 | #endif |
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| 114 | return(NULL); /* violation, 2check */ |
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| 115 | } |
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| 116 | int *e=(int *)omAlloc0((r->N+1)*sizeof(int)); |
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| 117 | int *s=(int *)omAlloc0((r->N+1)*sizeof(int)); |
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| 118 | p_GetExpV(p,e,r); |
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[ad1c3b] | 119 | |
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[4d2ab5c] | 120 | int j; |
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| 121 | // for (j=1; j<=r->N; j++) |
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| 122 | // L*lV gives the last position of the last block |
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| 123 | for (j=1; j<= L*lV ; j++) |
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| 124 | { |
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| 125 | if (e[j]==1) |
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| 126 | { |
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| 127 | s[j + (sh*lV)] = e[j]; /* actually 1 */ |
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[ad1c3b] | 128 | #ifdef PDEBUG |
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[4d2ab5c] | 129 | omCheckAddr(s); |
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[ad1c3b] | 130 | #endif |
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[4d2ab5c] | 131 | } |
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[ad1c3b] | 132 | #ifdef PDEBUG |
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[4d2ab5c] | 133 | else |
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| 134 | { |
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| 135 | if (e[j]!=0) |
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| 136 | { |
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[ad1c3b] | 137 | // Print("p_mLPshift: ex[%d]=%d\n",j,e[j]); |
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[4d2ab5c] | 138 | } |
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| 139 | } |
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[ad1c3b] | 140 | #endif |
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[4d2ab5c] | 141 | } |
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[b902246] | 142 | poly m = p_One(r); |
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[4d2ab5c] | 143 | p_SetExpV(m,s,r); |
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| 144 | freeT(e, r->N); |
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| 145 | freeT(s, r->N); |
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[ad1c3b] | 146 | /* pSetm(m); */ /* done in the pSetExpV */ |
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| 147 | /* think on the component and coefficient */ |
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| 148 | // number c = pGetCoeff(p); |
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| 149 | // p_SetCoeff0(m,p_GetCoeff(p,r),r); |
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| 150 | p_SetComp(m,p_GetComp(p,r),r); // component is preserved |
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| 151 | p_SetCoeff0(m,p_GetCoeff(p,r),r); // coeff is preserved |
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[4d2ab5c] | 152 | return(m); |
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| 153 | } |
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| 154 | |
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[3a67ea7] | 155 | poly pLPshift(poly p, int sh, int uptodeg, int lV) |
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| 156 | { |
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| 157 | /* assume shift takes place */ |
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[cb0fbe] | 158 | /* shifts the poly p by sh */ |
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[37a4c3] | 159 | /* deletes p */ |
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[cb0fbe] | 160 | |
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| 161 | /* assume sh and uptodeg agree */ |
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[3a67ea7] | 162 | |
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| 163 | if (sh == 0) return(p); /* the zero shift */ |
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| 164 | |
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[cb0fbe] | 165 | poly q = NULL; |
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[37a4c3] | 166 | poly pp = p; // pCopy(p); |
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[cb0fbe] | 167 | while (pp!=NULL) |
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[3a67ea7] | 168 | { |
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[cb0fbe] | 169 | q = p_Add_q(q, pmLPshift(pp,sh,uptodeg,lV),currRing); |
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| 170 | pIter(pp); |
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[3a67ea7] | 171 | } |
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[cb0fbe] | 172 | /* delete pp? */ |
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[3a67ea7] | 173 | /* int version: returns TRUE if it was successful */ |
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[cb0fbe] | 174 | return(q); |
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[3a67ea7] | 175 | } |
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| 176 | |
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| 177 | poly pmLPshift(poly p, int sh, int uptodeg, int lV) |
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| 178 | { |
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[4d2ab5c] | 179 | /* TODO: use a shortcut with p_ version */ |
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[3a67ea7] | 180 | /* pm is a monomial */ |
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| 181 | |
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| 182 | if (sh == 0) return(p); /* the zero shift */ |
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| 183 | |
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[cb0fbe] | 184 | if (sh < 0 ) |
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| 185 | { |
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| 186 | #ifdef PDEBUG |
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| 187 | Print("pmLPshift: negative shift requested"); |
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| 188 | #endif |
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| 189 | return(NULL); /* violation, 2check */ |
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| 190 | } |
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| 191 | |
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[3a67ea7] | 192 | int L = pmLastVblock(p,lV); |
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[cb0fbe] | 193 | if (L+sh-1 > uptodeg) |
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[3a67ea7] | 194 | { |
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[cb0fbe] | 195 | #ifdef PDEBUG |
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| 196 | Print("pmLPshift: too big shift requested"); |
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| 197 | #endif |
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[3a67ea7] | 198 | return(NULL); /* violation, 2check */ |
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| 199 | } |
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[cb0fbe] | 200 | int *e=(int *)omAlloc0((currRing->N+1)*sizeof(int)); |
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| 201 | int *s=(int *)omAlloc0((currRing->N+1)*sizeof(int)); |
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[3a67ea7] | 202 | pGetExpV(p,e); |
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| 203 | number c = pGetCoeff(p); |
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[cb0fbe] | 204 | int j; |
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| 205 | for (j=1; j<=currRing->N; j++) |
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[3a67ea7] | 206 | { |
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[ad1c3b] | 207 | if (e[j]==1) |
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[3a67ea7] | 208 | { |
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[cb0fbe] | 209 | s[j + (sh*lV)] = e[j]; /* actually 1 */ |
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[3a67ea7] | 210 | } |
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| 211 | } |
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| 212 | poly m = pOne(); |
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| 213 | pSetExpV(m,s); |
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[cb0fbe] | 214 | /* pSetm(m); */ /* done in the pSetExpV */ |
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[37a4c3] | 215 | /* think on the component */ |
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[3a67ea7] | 216 | pSetCoeff0(m,c); |
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| 217 | freeT(e, currRing->N); |
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| 218 | freeT(s, currRing->N); |
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| 219 | return(m); |
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| 220 | } |
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| 221 | |
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| 222 | int pLastVblock(poly p, int lV) |
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| 223 | { |
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| 224 | /* returns the number of maximal block */ |
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| 225 | /* appearing among the monomials of p */ |
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[37a4c3] | 226 | /* the 0th block is the 1st one */ |
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[4d2ab5c] | 227 | poly q = p; //p_Copy(p,currRing); /* need it ? */ |
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[cb0fbe] | 228 | int ans = 0; |
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| 229 | int ansnew = 0; |
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[3a67ea7] | 230 | while (q!=NULL) |
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| 231 | { |
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| 232 | ansnew = pmLastVblock(q,lV); |
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[cb0fbe] | 233 | ans = si_max(ans,ansnew); |
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[3a67ea7] | 234 | pIter(q); |
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| 235 | } |
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[cb0fbe] | 236 | /* do not need to delete q */ |
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[3a67ea7] | 237 | return(ans); |
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| 238 | } |
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| 239 | |
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| 240 | int pmLastVblock(poly p, int lV) |
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| 241 | { |
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| 242 | /* for a monomial p, returns the number of the last block */ |
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| 243 | /* where a nonzero exponent is sitting */ |
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[4d2ab5c] | 244 | if (pIsConstantPoly(p)) |
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| 245 | { |
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| 246 | return(int(0)); |
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| 247 | } |
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[cb0fbe] | 248 | int *e=(int *)omAlloc0((currRing->N+1)*sizeof(int)); |
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[3a67ea7] | 249 | pGetExpV(p,e); |
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| 250 | int j,b; |
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[cb0fbe] | 251 | j = currRing->N; |
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[3a67ea7] | 252 | while ( (!e[j]) && (j>=1) ) j--; |
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[cb0fbe] | 253 | if (j==0) |
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| 254 | { |
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| 255 | #ifdef PDEBUG |
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[37a4c3] | 256 | Print("pmLastVblock: unexpected zero exponent vector"); |
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| 257 | PrintLn(); |
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[cb0fbe] | 258 | #endif |
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| 259 | return(j); |
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| 260 | } |
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| 261 | b = (int)(j/lV) + 1; /* the number of the block, >=1 */ |
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[3a67ea7] | 262 | return (b); |
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| 263 | } |
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| 264 | |
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[4d2ab5c] | 265 | int p_LastVblockT(poly p, int lV, kStrategy strat, const ring r) |
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| 266 | { |
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| 267 | /* returns the number of maximal block */ |
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| 268 | /* appearing among the monomials of p */ |
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| 269 | /* the 0th block is the 1st one */ |
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| 270 | |
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| 271 | /* p is like TObject: lm in currRing = r, tail in tailRing */ |
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| 272 | assume(p_LmCheckIsFromRing(p,r)); |
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| 273 | assume(p_CheckIsFromRing(pNext(p),strat->tailRing)); |
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| 274 | |
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| 275 | int ans = p_mLastVblock(p, lV, r); // Block of LM |
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| 276 | poly q = pNext(p); |
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| 277 | int ansnew = 0; |
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| 278 | while (q != NULL) |
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| 279 | { |
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| 280 | ansnew = p_mLastVblock(q, lV, strat->tailRing); |
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| 281 | ans = si_max(ans,ansnew); |
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| 282 | pIter(q); |
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| 283 | } |
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| 284 | /* do not need to delete q */ |
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| 285 | return(ans); |
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| 286 | } |
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| 287 | |
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| 288 | int p_LastVblock(poly p, int lV, const ring r) |
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| 289 | { |
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| 290 | /* returns the number of maximal block */ |
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| 291 | /* appearing among the monomials of p */ |
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| 292 | /* the 0th block is the 1st one */ |
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| 293 | poly q = p; //p_Copy(p,currRing); /* need it ? */ |
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| 294 | int ans = 0; |
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| 295 | int ansnew = 0; |
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| 296 | while (q!=NULL) |
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| 297 | { |
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| 298 | ansnew = p_mLastVblock(q, lV, r); |
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| 299 | ans = si_max(ans,ansnew); |
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| 300 | pIter(q); |
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| 301 | } |
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| 302 | /* do not need to delete q */ |
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| 303 | return(ans); |
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| 304 | } |
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| 305 | |
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| 306 | int p_mLastVblock(poly p, int lV, const ring r) |
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| 307 | { |
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| 308 | /* for a monomial p, returns the number of the last block */ |
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| 309 | /* where a nonzero exponent is sitting */ |
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| 310 | if (p_LmIsConstant(p,r)) |
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| 311 | { |
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| 312 | return(0); |
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| 313 | } |
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| 314 | int *e=(int *)omAlloc0((r->N+1)*sizeof(int)); |
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| 315 | p_GetExpV(p,e,r); |
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| 316 | int j,b; |
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| 317 | j = r->N; |
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| 318 | while ( (!e[j]) && (j>=1) ) j--; |
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| 319 | if (j==0) |
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| 320 | { |
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| 321 | #ifdef PDEBUG |
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| 322 | Print("pmLastVblock: unexpected zero exponent vector"); |
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| 323 | PrintLn(); |
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| 324 | #endif |
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| 325 | return(j); |
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| 326 | } |
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| 327 | b = (int)((j+lV-1)/lV); /* the number of the block, >=1 */ |
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| 328 | freeT(e,r->N); |
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| 329 | return (b); |
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| 330 | } |
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| 331 | |
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| 332 | int pFirstVblock(poly p, int lV) |
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| 333 | { |
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| 334 | /* returns the number of maximal block */ |
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| 335 | /* appearing among the monomials of p */ |
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| 336 | /* the 0th block is the 1st one */ |
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| 337 | poly q = p; //p_Copy(p,currRing); /* need it ? */ |
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| 338 | int ans = 0; |
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| 339 | int ansnew = 0; |
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| 340 | while (q!=NULL) |
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| 341 | { |
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| 342 | ansnew = pmFirstVblock(q,lV); |
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| 343 | ans = si_min(ans,ansnew); |
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| 344 | pIter(q); |
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| 345 | } |
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| 346 | /* do not need to delete q */ |
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| 347 | return(ans); |
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| 348 | } |
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| 349 | |
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| 350 | int pmFirstVblock(poly p, int lV) |
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| 351 | { |
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| 352 | if (pIsConstantPoly(p)) |
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| 353 | { |
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| 354 | return(int(0)); |
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| 355 | } |
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| 356 | /* for a monomial p, returns the number of the first block */ |
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| 357 | /* where a nonzero exponent is sitting */ |
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| 358 | int *e=(int *)omAlloc0((currRing->N+1)*sizeof(int)); |
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| 359 | pGetExpV(p,e); |
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| 360 | int j,b; |
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| 361 | j = 1; |
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| 362 | while ( (!e[j]) && (j<=currRing->N-1) ) j++; |
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| 363 | if (j==currRing->N + 1) |
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| 364 | { |
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| 365 | #ifdef PDEBUG |
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| 366 | Print("pmFirstVblock: unexpected zero exponent vector"); |
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| 367 | PrintLn(); |
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| 368 | #endif |
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| 369 | return(j); |
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| 370 | } |
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| 371 | b = (int)(j/lV)+1; /* the number of the block, 1<= N <= currRing->N */ |
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| 372 | return (b); |
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| 373 | } |
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| 374 | |
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[1c473f] | 375 | /* there should be two routines: */ |
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[ad1c3b] | 376 | /* 1. test place-squarefreeness: in homog this suffices: isInV */ |
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[1c473f] | 377 | /* 2. test the presence of a hole -> in the tail??? */ |
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[4d2ab5c] | 378 | |
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[3a67ea7] | 379 | int isInV(poly p, int lV) |
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| 380 | { |
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[ad1c3b] | 381 | /* investigate only the leading monomial of p in currRing */ |
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[dabe365] | 382 | if ( pIsConstant(p) ) return(1); |
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[cb0fbe] | 383 | if (lV <= 0) return(0); |
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[3a67ea7] | 384 | /* returns 1 iff p is in V */ |
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[cb0fbe] | 385 | /* that is in each block up to a certain one there is only one nonzero exponent */ |
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[3a67ea7] | 386 | /* lV = the length of V = the number of orig vars */ |
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[cb0fbe] | 387 | int *e = (int *)omAlloc0((currRing->N+1)*sizeof(int)); |
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[ad1c3b] | 388 | int b = (int)((currRing->N +lV-1)/lV); /* the number of blocks */ |
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| 389 | //int b = (int)(currRing->N)/lV; |
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[cb0fbe] | 390 | int *B = (int *)omAlloc0((b+1)*sizeof(int)); /* the num of elements in a block */ |
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[3a67ea7] | 391 | pGetExpV(p,e); |
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| 392 | int i,j; |
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| 393 | for (j=1; j<=b; j++) |
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| 394 | { |
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| 395 | /* we go through all the vars */ |
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| 396 | /* by blocks in lV vars */ |
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| 397 | for (i=(j-1)*lV + 1; i<= j*lV; i++) |
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| 398 | { |
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[4d2ab5c] | 399 | if (e[i]) B[j] = B[j]+1; |
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[3a67ea7] | 400 | } |
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| 401 | } |
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[ad1c3b] | 402 | // j = b; |
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[37a4c3] | 403 | // while ( (!B[j]) && (j>=1)) j--; |
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| 404 | for (j=b; j>=1; j--) |
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| 405 | { |
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| 406 | if (B[j]!=0) break; |
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| 407 | } |
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[ad1c3b] | 408 | /* do not need e anymore */ |
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| 409 | freeT(e, currRing->N); |
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[37a4c3] | 410 | |
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[ad1c3b] | 411 | if (j==0) goto ret_true; |
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| 412 | // { |
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| 413 | // /* it is a zero exp vector, which is in V */ |
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| 414 | // freeT(B, b); |
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| 415 | // return(1); |
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| 416 | // } |
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| 417 | /* now B[j] != 0 and we test place-squarefreeness */ |
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[3a67ea7] | 418 | for (j; j>=1; j--) |
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| 419 | { |
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| 420 | if (B[j]!=1) |
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| 421 | { |
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[ad1c3b] | 422 | freeT(B, b); |
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[3a67ea7] | 423 | return(0); |
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| 424 | } |
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| 425 | } |
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[ad1c3b] | 426 | ret_true: |
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| 427 | freeT(B, b); |
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[3a67ea7] | 428 | return(1); |
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| 429 | } |
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| 430 | |
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[dabe365] | 431 | int poly_isInV(poly p, int lV) |
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| 432 | { |
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| 433 | /* tests whether the whole polynomial p in in V */ |
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| 434 | poly q = p; |
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| 435 | while (q!=NULL) |
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| 436 | { |
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| 437 | if ( !isInV(q,lV) ) |
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| 438 | { |
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| 439 | return(0); |
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| 440 | } |
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| 441 | q = pNext(q); |
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| 442 | } |
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| 443 | return(1); |
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| 444 | } |
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| 445 | |
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| 446 | int ideal_isInV(ideal I, int lV) |
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| 447 | { |
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| 448 | /* tests whether each polynomial of an ideal I lies in in V */ |
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| 449 | int i; |
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| 450 | int s = IDELEMS(I)-1; |
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| 451 | for(i = 0; i <= s; i++) |
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| 452 | { |
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| 453 | if ( !poly_isInV(I->m[i],lV) ) |
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| 454 | { |
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| 455 | return(0); |
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| 456 | } |
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| 457 | } |
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| 458 | return(1); |
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| 459 | } |
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| 460 | |
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| 461 | |
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[4d2ab5c] | 462 | int itoInsert(poly p, int uptodeg, int lV, const ring r) |
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| 463 | { |
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| 464 | /* for poly in lmCR/tailTR presentation */ |
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[ad1c3b] | 465 | /* the below situation (commented out) might happen! */ |
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[4d2ab5c] | 466 | // if (r == currRing) |
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| 467 | // { |
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| 468 | // "Current ring is not expected in toInsert"; |
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| 469 | // return(0); |
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| 470 | // } |
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| 471 | /* compute the number of insertions */ |
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| 472 | int i = p_mLastVblock(p, lV, currRing); |
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| 473 | if (pNext(p) != NULL) |
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| 474 | { |
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| 475 | i = si_max(i, p_LastVblock(pNext(p), lV, r) ); |
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| 476 | } |
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| 477 | // i = uptodeg - i +1; |
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| 478 | i = uptodeg - i; |
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[1c473f] | 479 | // p_wrp(p,currRing,r); Print("----i:%d",i); PrintLn(); |
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[4d2ab5c] | 480 | return(i); |
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| 481 | } |
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| 482 | |
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[ad1c3b] | 483 | poly p_ShrinkT(poly p, int lV, kStrategy strat, const ring r) |
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| 484 | //poly p_Shrink(poly p, int uptodeg, int lV, kStrategy strat, const ring r) |
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| 485 | { |
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| 486 | /* p is like TObject: lm in currRing = r, tail in tailRing */ |
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| 487 | /* proc shrinks the poly p in ring r */ |
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| 488 | /* lV = the length of V = the number of orig vars */ |
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| 489 | /* check assumes/exceptions */ |
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| 490 | /* r->N is a multiple of lV */ |
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| 491 | |
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| 492 | if (p==NULL) return(p); |
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| 493 | |
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| 494 | assume(p_LmCheckIsFromRing(p,r)); |
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| 495 | assume(p_CheckIsFromRing(pNext(p),strat->tailRing)); |
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| 496 | |
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| 497 | poly q = NULL; |
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| 498 | poly s = p_mShrink(p, lV, r); // lm in currRing |
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| 499 | poly pp = pNext(p); |
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| 500 | |
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| 501 | while (pp != NULL) |
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| 502 | { |
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| 503 | // q = p_Add_q(q, p_mShrink(pp,uptodeg,lV,strat->tailRing),strat->tailRing); |
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| 504 | q = p_Add_q(q, p_mShrink(pp,lV,strat->tailRing),strat->tailRing); |
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| 505 | pIter(pp); |
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| 506 | } |
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| 507 | pNext(s) = q; |
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| 508 | return(s); |
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| 509 | } |
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| 510 | |
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| 511 | poly p_Shrink(poly p, int lV, const ring r) |
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| 512 | { |
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| 513 | /* proc shrinks the poly p in ring r */ |
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| 514 | /* lV = the length of V = the number of orig vars */ |
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| 515 | /* check assumes/exceptions */ |
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| 516 | /* r->N is a multiple of lV */ |
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| 517 | |
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| 518 | if (p==NULL) return(p); |
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| 519 | assume(p_CheckIsFromRing(p,r)); |
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| 520 | poly q = NULL; |
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| 521 | poly pp = p; |
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| 522 | |
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| 523 | while (pp != NULL) |
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| 524 | { |
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| 525 | q = p_Add_q(q, p_mShrink(pp,lV,r),r); |
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| 526 | pIter(pp); |
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| 527 | } |
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| 528 | return(q); |
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| 529 | } |
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| 530 | |
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| 531 | poly p_mShrink(poly p, int lV, const ring r) |
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| 532 | { |
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| 533 | /* shrinks the monomial p in ring r */ |
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| 534 | /* lV = the length of V = the number of orig vars */ |
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| 535 | |
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| 536 | /* check assumes/exceptions */ |
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| 537 | /* r->N is a multiple of lV */ |
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| 538 | |
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| 539 | int *e = (int *)omAlloc0((r->N+1)*sizeof(int)); |
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| 540 | int b = (int)((r->N +lV-1)/lV); /* the number of blocks */ |
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| 541 | // int *B = (int *)omAlloc0((b+1)*sizeof(int)); /* the num of elements in a block */ |
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| 542 | int *S = (int *)omAlloc0((r->N+1)*sizeof(int)); /* the shrinked exponent */ |
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| 543 | p_GetExpV(p,e,r); |
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| 544 | int i,j; int cnt = 1; //counter for blocks in S |
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| 545 | for (j=1; j<=b; j++) |
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| 546 | { |
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| 547 | /* we go through all the vars */ |
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| 548 | /* by blocks in lV vars */ |
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| 549 | for (i=(j-1)*lV + 1; i<= j*lV; i++) |
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| 550 | { |
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| 551 | if (e[i]==1) |
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| 552 | { |
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| 553 | // B[j] = B[j]+1; // for control in V? |
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| 554 | S[(cnt-1)*lV + (i - (j-1)*lV)] = e[i]; |
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| 555 | /* assuming we are in V, can interrupt here */ |
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| 556 | cnt++; |
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| 557 | // break; //results in incomplete shrink! |
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| 558 | i = j*lV; // manual break under assumption p is in V |
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| 559 | } |
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| 560 | } |
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| 561 | } |
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| 562 | #ifdef PDEBUG |
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| 563 | // Print("p_mShrink: cnt = [%d], b = %d\n",cnt,b); |
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| 564 | #endif |
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| 565 | // cnt -1 <= b must hold! |
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| 566 | // freeT(B, b); |
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[b902246] | 567 | poly s = p_One(r); |
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[ad1c3b] | 568 | p_SetExpV(s,S,r); |
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| 569 | freeT(e, r->N); |
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| 570 | freeT(S, r->N); |
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| 571 | /* p_Setm(s,r); // done by p_SetExpV */ |
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| 572 | p_SetComp(s,p_GetComp(p,r),r); // component is preserved |
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| 573 | p_SetCoeff(s,p_GetCoeff(p,r),r); // coeff is preserved |
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| 574 | #ifdef PDEBUG |
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| 575 | // Print("p_mShrink: from "); p_wrp(p,r); Print(" to "); p_wrp(s,r); PrintLn(); |
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| 576 | #endif |
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| 577 | return(s); |
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| 578 | } |
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[4d2ab5c] | 579 | |
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[cb0fbe] | 580 | /* shiftgb stuff */ |
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[3a67ea7] | 581 | |
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[37a4c3] | 582 | |
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| 583 | /* remarks: cleanT : just deletion |
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| 584 | enlargeT: just reallocation */ |
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| 585 | |
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[07625cb] | 586 | #endif |
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