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implemented strassen multiplication

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jiri committed 2026-11-05 21:13:58 +01:00
1 parent 723823dd50
commit 6812b9eb5e
7 files changed
+169 -46
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mat.h
+2 -5
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@@ -438,11 +438,8 @@ public:
void printsorted(std::ostream &s, int direction=1, bool absvalue=false, bool stable=false, typename LA_traits<T>::normtype thr=0, int topmax=0) const;
#ifndef NO_STRASSEN
//! Strassen's multiplication (better than \f$\mathacal{O}(n^3)\f$, analogous syntax to \see NRMat<T>::gemm() )
void strassen(const T beta, const NRMat &a, const char transa, const NRMat &b, const char transb, const T alpha);
void s_cutoff(const int,const int,const int,const int) const;
#endif
//! Strassen-Winograd multiplication (\f$\mathcal{O}(n^{2.81})\f$), the same operation as \see NRMat<T>::gemm(); blocks with a dimension <= cutoff are multiplied by gemm
void strassen(const T &beta, const NRMat &a, const char transa, const NRMat &b, const char transb, const T &alpha, const int cutoff=LA_traits<T>::strassen_cutoff());
void swap(NRMat &rhs) //more efficient swap than via tmp and constructors and operator=
{
int tmpnn=nn; nn=rhs.nn; rhs.nn=tmpnn;