51 lines
1.9 KiB
C++
51 lines
1.9 KiB
C++
/*
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LA: linear algebra C++ interface library
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Copyright (C) 2008 Jiri Pittner <jiri.pittner@jh-inst.cas.cz> or <jiri@pittnerovi.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mat.h"
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#ifndef NO_STRASSEN
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namespace LA {
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/*Strassen algorithm*/
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// called routine is fortran-compatible
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extern "C" void fmm(const char c_transa,const char c_transb,const int m,const int n,const int k,const double alpha,
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const double *a,const int lda,const double *b,const int ldb,const double beta,double *c,const int ldc,
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double *d_aux,int i_naux);
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extern "C" void strassen_cutoff(int c, int c1, int c2, int c3);
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template<>
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void NRMat<double>::s_cutoff(const int c, const int c1, const int c2, const int c3) const
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{ strassen_cutoff(c,c1,c2,c3);}
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template<>
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void NRMat<double>::strassen(const double beta, const NRMat<double> &a, const char transa, const NRMat<double> &b, const char transb, const double alpha)
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{
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int l(transa=='n'?a.nn:a.mm);
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int k(transa=='n'?a.mm:a.nn);
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int kk(transb=='n'?b.nn:b.mm);
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int ll(transb=='n'?b.mm:b.nn);
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if(l!=nn|| ll!=mm||k!=kk) laerror("incompatible (or undefined size) matrices in strassen");
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copyonwrite();
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//swap transpositions and order of matrices
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fmm(transb,transa,mm,nn,k,alpha,b,b.mm, a, a.mm, beta,*this, mm,NULL,0);
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}
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}//namespace
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#endif
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