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6d749c172a
The size_t type means a number of _bytes_, and it was misused as counting e.g. the number of rows/columns in a matrix. Moreover, it is unsigned, which can give strange bugs if a signed/unsigned mismatch occurs.
126 lines
3.1 KiB
C++
126 lines
3.1 KiB
C++
/*
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* Tiny Vector Matrix Library
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* Dense Vector Matrix Libary of Tiny size using Expression Templates
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*
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* Copyright (C) 2001 - 2003 Olaf Petzold <opetzold@users.sourceforge.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: General.h,v 1.9 2004/09/16 09:14:18 opetzold Exp $
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*/
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#ifndef TVMET_UTIL_GENERAL_H
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#define TVMET_UTIL_GENERAL_H
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/** forward */
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namespace tvmet {
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template<class T, int Rows, int Cols> class Matrix;
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template<class T, int Sz> class Vector;
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}
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namespace tvmet {
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namespace util {
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/*
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* \defgroup _util_function
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* \brief Usefull utility functions
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*/
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/**
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* \fn Gemm(const Matrix<T, Rows, Cols>& m1, const Matrix<T, Rows, Cols>& m2, Matrix<T, Rows, Cols>& m3)
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* \brief General matrix matrix multiplication using loops.
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* \ingroup _util_function
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*/
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template<class T, int Rows, int Cols>
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inline
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void
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Gemm(const Matrix<T, Rows, Cols>& m1, const Matrix<T, Rows, Cols>& m2,
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Matrix<T, Rows, Cols>& m3)
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{
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for (int i = 0; i < Rows; ++i) {
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for (int j = 0; j < Cols; ++j) {
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T sum(0);
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for (int k = 0; k < Cols; ++k) {
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sum += m1(i,k) * m2(k,j);
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}
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m3(i,j) = sum;
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}
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}
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}
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/**
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* \fn Gemv(const Matrix<T, Rows, Cols>& m, const Vector<T, Cols>& v, Vector<T, Cols>& v2)
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* \brief General matrix vector multiplication using loops.
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* \ingroup _util_function
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*/
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template<class T, int Rows, int Cols>
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inline
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void
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Gemv(const Matrix<T, Rows, Cols>& m, const Vector<T, Cols>& v,
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Vector<T, Cols>& v2)
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{
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for (int i = 0; i < Rows; ++i){
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v2(i) = T(0); // clean up before use
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for (int j = 0; j < Cols; ++j) {
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v2(i) += m(i,j) * v(j);
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}
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}
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}
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/**
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* \fn Gevvmul(const Vector<T, Sz>& v1, const Vector<T, Sz>& v2, Vector<T, Sz>& v3)
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* \brief General vector vector elementwise multiplication using loop.
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* \ingroup _util_function
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*/
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template<class T, int Sz>
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inline
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void
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Gevvmul(const Vector<T, Sz>& v1, const Vector<T, Sz>& v2,
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Vector<T, Sz>& v3)
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{
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for(int i = 0; i < Sz; ++i)
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v3(i) = v1(i) * v2(i);
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}
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/**
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* \fn Gevvadd(const Vector<T, Sz>& v1, const Vector<T, Sz>& v2, Vector<T, Sz>& v3)
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* \brief General vector vector elementwise multiplication using loop.
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* \ingroup _util_function
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*/
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template<class T, int Sz>
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inline
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void
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Gevvadd(const Vector<T, Sz>& v1, const Vector<T, Sz>& v2,
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Vector<T, Sz>& v3)
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{
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for(int i = 0; i < Sz; ++i)
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v3(i) = v1(i) + v2(i);
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}
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} // namespace util
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} // namespace tvmet
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#endif // TVMET_UTIL_GENERAL_H
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// Local Variables:
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// mode:C++
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// End:
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