Changeset 9f93d9 in git

Timestamp:

Jan 30, 2017, 3:16:26 PM (6 years ago)

Author:

Hans Schoenemann <hannes@…>

Branches:

(u'spielwiese', '0d6b7fcd9813a1ca1ed4220cfa2b104b97a0a003')

Children:

255be23a24e8d8e66bb9940f2b28682b72397092

Parents:

112f6ef2f15862ab65b71de204f611522d5b55c7

Message:

add: p_GcdMon

Location:

libpolys/polys/monomials

Files:

• p_polys.cc (modified) (1 diff)
• p_polys.h (modified) (1 diff)

libpolys/polys/monomials/p_polys.cc

@@ -4752 +4752 @@
 }
 
+poly p_GcdMon(poly f, poly g, const ring r)
+{
+  assume(f!=NULL);
+  assume(g!=NULL);
+  assume(pNext(f)==NULL);
+  poly G=p_Head(f,r);
+  poly h=g;
+  int *mf=(int*)omAlloc((r->N+1)*sizeof(int));
+  p_GetExpV(f,mf,r);
+  int *mh=(int*)omAlloc((r->N+1)*sizeof(int));
+  BOOLEAN const_mon;
+  BOOLEAN one_coeff=n_IsOne(pGetCoeff(G),r->cf);
+  loop
+  {
+    if (h==NULL) break;
+    one_coeff=TRUE;
+    if(!one_coeff)
+    {
+      number n=n_SubringGcd(pGetCoeff(G),pGetCoeff(h),r->cf);
+      one_coeff=n_IsOne(n,r->cf);
+      p_SetCoeff(G,n,r);
+    }
+    p_GetExpV(h,mh,r);
+    const_mon=TRUE;
+    for(unsigned j=r->N;j!=0;j--)
+    {
+      if (mh[j]<mf[j]) mf[j]=mh[j];
+      if (mf[j]>0) const_mon=FALSE;
+    }
+    if (one_coeff && const_mon) break;
+    pIter(h);
+  }
+  mf[0]=0;
+  p_SetExpV(G,mf,r); // included is p_SetComp, p_Setm
+  omFreeSize(mf,(r->N+1)*sizeof(int));
+  omFreeSize(mh,(r->N+1)*sizeof(int));
+  return G;
+}

libpolys/polys/monomials/p_polys.h

@@ -2024 +2024 @@
 
 int p_Compare(const poly a, const poly b, const ring R);
+
+/// polynomial gcd for f=mon
+poly p_GcdMon(poly f, poly g, const ring r);
 #endif // P_POLYS_H