MinorProcessor.cc File Reference

#include "kernel/mod2.h"
#include "kernel/linear_algebra/MinorProcessor.h"
#include "polys/kbuckets.h"
#include "kernel/structs.h"
#include "kernel/polys.h"
#include "kernel/GBEngine/kstd1.h"
#include "kernel/ideals.h"

Go to the source code of this file.

Functions
int	getReduction (const int i, const ideal &iSB)
static void	addOperationBucket (poly f1, poly f2, kBucket_pt bucket)
static void	elimOperationBucketNoDiv (poly &p1, poly p2, poly p3, poly p4)
void	elimOperationBucket (poly &p1, poly &p2, poly &p3, poly &p4, poly &p5, number &c5, int p5Len)

Function Documentation

addOperationBucket()

static void addOperationBucket ( poly  f1, poly  f2, kBucket_pt  bucket  )

static

Definition at line 1261 of file MinorProcessor.cc.

{
  /* fills all terms of f1 * f2 into the bucket */
  poly a = f1; poly b = f2;
  int aLen = pLength(a); int bLen = pLength(b);
  if (aLen > bLen)
  {
    b = f1; a = f2; bLen = aLen;
  }
  pNormalize(b);
 
  while (a != NULL)
  {
    /* The next line actually uses only LT(a): */
    kBucket_Plus_mm_Mult_pp(bucket, a, b, bLen);
    a = pNext(a);
  }
}

elimOperationBucket()

void elimOperationBucket	(	poly &	p1,
		poly &	p2,
		poly &	p3,
		poly &	p4,
		poly &	p5,
		number &	c5,
		int	p5Len
	)

Definition at line 1321 of file MinorProcessor.cc.

{
#ifdef COUNT_AND_PRINT_OPERATIONS
  if ((pLength(p1) != 0) && (pLength(p2) != 0))
  {
    multsPoly++;
    multsMon += pLength(p1) * pLength(p2);
  }
  if ((pLength(p3) != 0) && (pLength(p4) != 0))
  {
    multsPoly++;
    multsMon += pLength(p3) * pLength(p4);
  }
  if ((pLength(p1) != 0) && (pLength(p2) != 0) &&
      (pLength(p3) != 0) && (pLength(p4) != 0))
    addsPoly++;
#endif
  kBucket_pt myBucket = kBucketCreate(currRing);
  addOperationBucket(p1, p2, myBucket);
  poly p3Neg = pNeg(pCopy(p3));
  addOperationBucket(p3Neg, p4, myBucket);
  pDelete(&p3Neg);
 
  /* Now, myBucket contains all terms of p1 * p2 - p3 * p4.
     Now we need to perform the polynomial division myBucket / p5
     which is known to work without remainder: */
  pDelete(&p1); poly helperPoly = NULL;
 
  poly bucketLm = pCopy(kBucketGetLm(myBucket));
  while (bucketLm != NULL)
  {
    /* divide bucketLm by the leading term of p5 and put result into bucketLm;
       we start with the coefficients;
       note that bucketLm will always represent a term */
    number coeff = nDiv(pGetCoeff(bucketLm), c5);
    nNormalize(coeff);
    pSetCoeff(bucketLm, coeff);
    /* subtract exponent vector of p5 from that of quotient; modifies
       quotient */
    p_ExpVectorSub(bucketLm, p5, currRing);
#ifdef COUNT_AND_PRINT_OPERATIONS
    divsMon++;
    multsMonForDiv += p5Len;
    multsMon += p5Len;
    savedMultsMFD++;
    multsPoly++;
    multsPolyForDiv++;
    addsPoly++;
    addsPolyForDiv++;
#endif
    kBucket_Minus_m_Mult_p(myBucket, bucketLm, p5, &p5Len);
    /* The following lines make bucketLm the new leading term of p1,
       i.e., put bucketLm in front of everything which is already in p1.
       Thus, after the while loop, we need to revert p1. */
    helperPoly = bucketLm;
    helperPoly->next = p1;
    p1 = helperPoly;
 
    bucketLm = pCopy(kBucketGetLm(myBucket));
  }
  p1 = pReverse(p1);
  kBucketDestroy(&myBucket);
}

elimOperationBucketNoDiv()

static void elimOperationBucketNoDiv ( poly &  p1, poly  p2, poly  p3, poly  p4  )

static

Definition at line 1286 of file MinorProcessor.cc.

{
#ifdef COUNT_AND_PRINT_OPERATIONS
  if ((pLength(p1) != 0) && (pLength(p2) != 0))
  {
    multsPoly++;
    multsMon += pLength(p1) * pLength(p2);
  }
  if ((pLength(p3) != 0) && (pLength(p4) != 0))
  {
    multsPoly++;
    multsMon += pLength(p3) * pLength(p4);
  }
  if ((pLength(p1) != 0) && (pLength(p2) != 0) &&
      (pLength(p3) != 0) && (pLength(p4) != 0))
    addsPoly++;
#endif
  kBucket_pt myBucket = kBucketCreate(currRing);
  addOperationBucket(p1, p2, myBucket);
  poly p3Neg = pNeg(pCopy(p3));
  addOperationBucket(p3Neg, p4, myBucket);
  pDelete(&p3Neg);
  pDelete(&p1);
  p1 = kBucketClear(myBucket);
  kBucketDestroy(&myBucket);
}

getReduction()

int getReduction	(	const int	i,
		const ideal &	iSB
	)

Definition at line 434 of file MinorProcessor.cc.

{
  if (i == 0) return 0;
  poly f = pISet(i);
  poly g = kNF(iSB, currRing->qideal, f);
  int result = 0;
  if (g != NULL) result = n_Int(pGetCoeff(g), currRing->cf);
  pDelete(&f);
  pDelete(&g);
  return result;
}