1 | // -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
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2 | /*****************************************************************************\ |
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3 | * Computer Algebra System SINGULAR |
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4 | \*****************************************************************************/ |
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5 | /** @file syzextra.cc |
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6 | * |
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7 | * New implementations for the computation of syzygies and resolutions |
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8 | * |
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9 | * ABSTRACT: Computation of Syzygies due to Schreyer |
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10 | * |
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11 | * @author Oleksandr Motsak |
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12 | * |
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13 | **/ |
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14 | /*****************************************************************************/ |
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15 | // include header file |
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16 | #include "kernel/mod2.h" |
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17 | #ifndef _GNU_SOURCE |
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18 | #define _GNU_SOURCE /*for qsort_r on cygwin, must be before system includes*/ |
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19 | #endif |
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20 | |
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21 | #include <string.h> |
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22 | |
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23 | |
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24 | #include "syzextra.h" |
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25 | |
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26 | #include "misc/intvec.h" |
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27 | |
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28 | #include "coeffs/coeffs.h" |
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29 | |
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30 | #include "polys/monomials/p_polys.h" |
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31 | #include "polys/monomials/ring.h" |
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32 | #include "polys/simpleideals.h" |
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33 | |
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34 | #include "kernel/polys.h" |
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35 | #include "kernel/ideals.h" |
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36 | |
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37 | #include <stdio.h> |
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38 | #include <stdlib.h> |
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39 | |
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40 | poly p_Tail(const poly p, const ring r) |
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41 | { |
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42 | if( UNLIKELY(p == NULL) ) |
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43 | return NULL; |
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44 | else |
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45 | return p_Copy( pNext(p), r ); |
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46 | } |
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47 | |
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48 | ideal id_Tail(const ideal id, const ring r) |
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49 | { |
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50 | if( UNLIKELY(id == NULL) ) |
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51 | return NULL; |
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52 | |
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53 | const ideal newid = idInit(IDELEMS(id),id->rank); |
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54 | |
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55 | for (int i=IDELEMS(id) - 1; i >= 0; i--) |
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56 | newid->m[i] = p_Tail( id->m[i], r ); |
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57 | |
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58 | newid->rank = id_RankFreeModule(newid, currRing); |
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59 | |
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60 | return newid; |
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61 | } |
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62 | |
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