*** empty log message ***

strassen.cc

@@ -0,0 +1,31 @@
+#include "la.h"
+/*Strassen algorithm*/
+// called routine is fortran-compatible
+extern "C" void fmm(const char c_transa,const char c_transb,const int m,const int n,const int k,const double alpha,
+                const double *a,const int lda,const double *b,const int ldb,const double beta,double *c,const int ldc,
+                double *d_aux,int i_naux);
+extern "C" void strassen_cutoff(int c, int c1, int c2, int c3);
+
+void NRMat<double>::s_cutoff(const int c, const int c1, const int c2, const int c3) const
+{ strassen_cutoff(c,c1,c2,c3);}
+void NRMat<double>::strassen(const double beta, const NRMat<double> &a, const char transa, const NRMat<double> &b, const char transb, const double alpha)
+{
+int l(transa=='n'?a.nn:a.mm);
+int k(transa=='n'?a.mm:a.nn);
+int kk(transb=='n'?b.nn:b.mm);
+int ll(transb=='n'?b.mm:b.nn);
+
+if(l!=nn|| ll!=mm||k!=kk) laerror("incompatible (or undefined size) matrices in strassen");
+
+copyonwrite();
+//swap transpositions and order of matrices
+fmm(transb,transa,mm,nn,k,alpha,b,b.mm, a, a.mm, beta,*this, mm,NULL,0);
+}
+
+//stub for f77 blas called from strassen routine
+extern "C" void xerbla_(const char *msg)
+{
+laerror(msg);
+}
+
+