1 | /**************************************** |
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2 | * Computer Algebra System SINGULAR * |
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3 | ****************************************/ |
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4 | /* $Id: shiftgb.cc,v 1.2 2007-06-24 16:44:41 levandov Exp $ */ |
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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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9 | #include "mod2.h" |
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10 | #include "febase.h" |
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11 | #include "ring.h" |
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12 | #include "polys.h" |
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13 | #include "numbers.h" |
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14 | #include "ideals.h" |
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15 | #include "matpol.h" |
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16 | #include "kbuckets.h" |
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17 | #include "kstd1.h" |
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18 | #include "sbuckets.h" |
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19 | #include "p_Mult_q.h" |
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20 | #include "kutil.h" |
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21 | #include "structs.h" |
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22 | #include "omalloc.h" |
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23 | #include "khstd.h" |
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24 | #include "kbuckets.h" |
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25 | #include "weight.h" |
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26 | #include "intvec.h" |
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27 | #include "structs.h" |
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28 | #include "kInline.cc" |
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29 | #include "stairc.h" |
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30 | #include "weight.h" |
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31 | #include "intvec.h" |
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32 | #include "timer.h" |
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33 | #include "shiftgb.h" |
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34 | #include "sca.h" |
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35 | |
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36 | |
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37 | #define freeT(A,v) omFreeSize((ADDRESS)A,(v+1)*sizeof(int)) |
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38 | |
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39 | poly pLPshift(poly p, int sh, int uptodeg, int lV) |
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40 | { |
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41 | /* assume shift takes place */ |
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42 | /* shifts the poly p by sh */ |
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43 | |
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44 | /* assume sh and uptodeg agree */ |
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45 | |
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46 | if (sh == 0) return(p); /* the zero shift */ |
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47 | |
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48 | poly q = NULL; |
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49 | poly pp = pCopy(p); |
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50 | while (pp!=NULL) |
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51 | { |
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52 | q = p_Add_q(q, pmLPshift(pp,sh,uptodeg,lV),currRing); |
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53 | pIter(pp); |
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54 | } |
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55 | /* delete pp? */ |
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56 | /* int version: returns TRUE if it was successful */ |
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57 | return(q); |
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58 | } |
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59 | |
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60 | poly pmLPshift(poly p, int sh, int uptodeg, int lV) |
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61 | { |
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62 | /* pm is a monomial */ |
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63 | |
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64 | if (sh == 0) return(p); /* the zero shift */ |
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65 | |
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66 | if (sh < 0 ) |
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67 | { |
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68 | #ifdef PDEBUG |
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69 | Print("pmLPshift: negative shift requested"); |
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70 | #endif |
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71 | return(NULL); /* violation, 2check */ |
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72 | } |
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73 | |
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74 | int L = pmLastVblock(p,lV); |
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75 | if (L+sh-1 > uptodeg) |
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76 | { |
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77 | #ifdef PDEBUG |
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78 | Print("pmLPshift: too big shift requested"); |
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79 | #endif |
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80 | return(NULL); /* violation, 2check */ |
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81 | } |
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82 | int *e=(int *)omAlloc0((currRing->N+1)*sizeof(int)); |
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83 | int *s=(int *)omAlloc0((currRing->N+1)*sizeof(int)); |
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84 | pGetExpV(p,e); |
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85 | number c = pGetCoeff(p); |
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86 | int j; |
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87 | for (j=1; j<=currRing->N; j++) |
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88 | { |
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89 | if (e[j]) |
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90 | { |
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91 | s[j + (sh*lV)] = e[j]; /* actually 1 */ |
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92 | } |
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93 | } |
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94 | poly m = pOne(); |
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95 | pSetExpV(m,s); |
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96 | /* pSetm(m); */ /* done in the pSetExpV */ |
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97 | pSetCoeff0(m,c); |
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98 | freeT(e, currRing->N); |
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99 | freeT(s, currRing->N); |
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100 | return(m); |
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101 | } |
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102 | |
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103 | int pLastVblock(poly p, int lV) |
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104 | { |
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105 | /* returns the number of maximal block */ |
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106 | /* appearing among the monomials of p */ |
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107 | poly q = pCopy(p); /* need it ? */ |
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108 | int ans = 0; |
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109 | int ansnew = 0; |
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110 | while (q!=NULL) |
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111 | { |
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112 | ansnew = pmLastVblock(q,lV); |
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113 | ans = si_max(ans,ansnew); |
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114 | pIter(q); |
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115 | } |
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116 | /* do not need to delete q */ |
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117 | return(ans); |
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118 | } |
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119 | |
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120 | int pmLastVblock(poly p, int lV) |
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121 | { |
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122 | /* for a monomial p, returns the number of the last block */ |
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123 | /* where a nonzero exponent is sitting */ |
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124 | int *e=(int *)omAlloc0((currRing->N+1)*sizeof(int)); |
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125 | pGetExpV(p,e); |
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126 | int j,b; |
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127 | j = currRing->N; |
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128 | while ( (!e[j]) && (j>=1) ) j--; |
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129 | if (j==0) |
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130 | { |
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131 | #ifdef PDEBUG |
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132 | Print("pmLastVblock: unexpected zero exponent"); |
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133 | #endif |
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134 | return(j); |
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135 | } |
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136 | b = (int)(j/lV) + 1; /* the number of the block, >=1 */ |
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137 | return (b); |
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138 | } |
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139 | |
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140 | int isInV(poly p, int lV) |
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141 | { |
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142 | if (lV <= 0) return(0); |
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143 | /* returns 1 iff p is in V */ |
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144 | /* that is in each block up to a certain one there is only one nonzero exponent */ |
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145 | /* lV = the length of V = the number of orig vars */ |
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146 | int *e = (int *)omAlloc0((currRing->N+1)*sizeof(int)); |
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147 | int b = (int)(currRing->N)/lV; /* the number of blocks */ |
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148 | int *B = (int *)omAlloc0((b+1)*sizeof(int)); /* the num of elements in a block */ |
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149 | pGetExpV(p,e); |
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150 | int i,j; |
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151 | for (j=1; j<=b; j++) |
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152 | { |
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153 | /* we go through all the vars */ |
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154 | /* by blocks in lV vars */ |
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155 | for (i=(j-1)*lV + 1; i<= j*lV; i++) |
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156 | { |
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157 | if (!e[i]) B[j] = B[j]+1; |
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158 | } |
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159 | } |
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160 | j = b; |
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161 | while ( (!B[j]) && (j>=1)) j--; |
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162 | if (j==0) |
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163 | { |
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164 | /* it is a zero exp vector, which is in V */ |
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165 | return(1); |
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166 | } |
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167 | /* now B[j] != 0 */ |
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168 | for (j; j>=1; j--) |
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169 | { |
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170 | if (B[j]!=1) |
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171 | { |
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172 | return(0); |
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173 | } |
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174 | } |
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175 | return(1); |
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176 | } |
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177 | |
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178 | /* shiftgb stuff */ |
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179 | |
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180 | void initBbaShift(ideal F,kStrategy strat) |
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181 | { |
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182 | int i; |
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183 | idhdl h; |
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184 | /* setting global variables ------------------- */ |
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185 | strat->enterS = enterSBba; |
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186 | |
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187 | strat->red = redFirstShift; |
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188 | |
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189 | /* perhaps the following? |
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190 | * strat->LazyPass *=4; |
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191 | * strat->red = redHomogShift; |
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192 | */ |
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193 | |
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194 | /* strat->red = redHoney; |
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195 | * if (strat->honey) |
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196 | * strat->red = redHoney; |
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197 | * else if (pLexOrder && !strat->homog) |
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198 | * strat->red = redLazy; |
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199 | * else |
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200 | * { |
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201 | * strat->LazyPass *=4; |
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202 | * strat->red = redHomog; |
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203 | * } |
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204 | *#ifdef HAVE_RINGS //TODO Oliver |
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205 | * if (rField_is_Ring(currRing)) { |
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206 | * strat->red = redRing2toM; |
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207 | * } |
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208 | *#endif |
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209 | */ |
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210 | |
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211 | if (pLexOrder && strat->honey) |
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212 | strat->initEcart = initEcartNormal; |
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213 | else |
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214 | strat->initEcart = initEcartBBA; |
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215 | if (strat->honey) |
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216 | strat->initEcartPair = initEcartPairMora; |
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217 | else |
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218 | strat->initEcartPair = initEcartPairBba; |
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219 | strat->kIdeal = NULL; |
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220 | //if (strat->ak==0) strat->kIdeal->rtyp=IDEAL_CMD; |
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221 | //else strat->kIdeal->rtyp=MODUL_CMD; |
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222 | //strat->kIdeal->data=(void *)strat->Shdl; |
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223 | if ((TEST_OPT_WEIGHTM)&&(F!=NULL)) |
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224 | { |
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225 | //interred machen Aenderung |
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226 | pFDegOld=pFDeg; |
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227 | pLDegOld=pLDeg; |
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228 | //h=ggetid("ecart"); |
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229 | //if ((h!=NULL) /*&& (IDTYP(h)==INTVEC_CMD)*/) |
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230 | //{ |
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231 | // ecartWeights=iv2array(IDINTVEC(h)); |
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232 | //} |
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233 | //else |
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234 | { |
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235 | ecartWeights=(short *)omAlloc((pVariables+1)*sizeof(short)); |
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236 | /*uses automatic computation of the ecartWeights to set them*/ |
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237 | kEcartWeights(F->m,IDELEMS(F)-1,ecartWeights); |
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238 | } |
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239 | pRestoreDegProcs(totaldegreeWecart, maxdegreeWecart); |
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240 | if (TEST_OPT_PROT) |
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241 | { |
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242 | for(i=1; i<=pVariables; i++) |
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243 | Print(" %d",ecartWeights[i]); |
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244 | PrintLn(); |
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245 | mflush(); |
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246 | } |
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247 | } |
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248 | } |
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249 | |
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