1 | /**************************************** |
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2 | * Computer Algebra System SINGULAR * |
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3 | ****************************************/ |
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4 | /*************************************************************** |
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5 | * File: pp_Mult_mm__Template.cc |
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6 | * Purpose: template for p_Mult_n |
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7 | * Author: obachman (Olaf Bachmann) |
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8 | * Created: 8/00 |
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9 | * Version: $Id: pp_Mult_mm_Noether__Template.cc,v 1.2 2000-11-28 11:50:56 obachman Exp $ |
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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 | * Returns: p*m, ll |
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15 | * ll == pLength(p*m) , if on input ll < 0 |
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16 | * pLength(p) - pLength(p*m), if on input ll >= 0 |
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17 | * Const: p, m |
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18 | * |
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19 | ***************************************************************/ |
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20 | poly pp_Mult_mm_Noether(poly p, const poly m, const poly spNoether, int &ll, |
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21 | const ring ri, poly &last) |
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22 | { |
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23 | p_Test(p, ri); |
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24 | p_LmTest(m, ri); |
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25 | assume(spNoether != NULL); |
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26 | if (p == NULL) |
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27 | { |
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28 | ll = 0; |
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29 | last = NULL; |
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30 | return NULL; |
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31 | } |
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32 | spolyrec rp; |
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33 | poly q = &rp, r; |
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34 | const unsigned long *spNoether_exp = spNoether->exp; |
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35 | number ln = pGetCoeff(m); |
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36 | omBin bin = ri->PolyBin; |
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37 | DECLARE_LENGTH(const unsigned long length = ri->ExpL_Size); |
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38 | DECLARE_ORDSGN(const long* ordsgn = ri->ordsgn); |
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39 | const unsigned long* m_e = m->exp; |
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40 | pAssume(!n_IsZero(ln,ri)); |
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41 | pAssume1(p_GetComp(m, ri) == 0 || p_MaxComp(p, ri) == 0); |
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42 | int l = 0; |
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43 | |
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44 | do |
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45 | { |
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46 | p_AllocBin(r, bin, ri); |
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47 | p_MemSum(r->exp, p->exp, m_e, length); |
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48 | p_MemAddAdjust(r, ri); |
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49 | |
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50 | p_MemCmp(r->exp, spNoether_exp, length, ordsgn, goto Continue, goto Continue, goto Break); |
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51 | |
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52 | Break: |
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53 | p_FreeBinAddr(r, ri); |
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54 | break; |
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55 | |
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56 | Continue: |
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57 | l++; |
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58 | q = pNext(q) = r; |
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59 | pSetCoeff0(q, n_Mult(ln, pGetCoeff(p), ri)); |
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60 | pIter(p); |
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61 | } while (p != NULL); |
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62 | |
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63 | if (ll < 0) |
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64 | ll = l; |
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65 | else |
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66 | ll = pLength(p); |
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67 | |
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68 | if (q != &rp) |
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69 | last = q; |
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70 | pNext(q) = NULL; |
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71 | |
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72 | p_Test(pNext(&rp), ri); |
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73 | return pNext(&rp); |
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74 | } |
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75 | |
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76 | |
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