mirror of
https://gitlab.com/libeigen/eigen.git
synced 2026-04-10 11:34:33 +08:00
3036eeca0a
release of tvmet (inactive for 2 years and developer unreachable) as the basis for eigen2, because it provides seemingly good expression template mechanisms, we want that, and it would take years to reinvent that wheel. We'll see. So this commit imports the last tvmet release.
126 lines
3.2 KiB
C++
126 lines
3.2 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, std::size_t Rows, std::size_t Cols> class Matrix;
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template<class T, std::size_t 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, std::size_t Rows, std::size_t 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 (std::size_t i = 0; i < Rows; ++i) {
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for (std::size_t j = 0; j < Cols; ++j) {
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T sum(0);
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for (std::size_t 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, std::size_t Rows, std::size_t 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 (std::size_t i = 0; i < Rows; ++i){
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v2(i) = T(0); // clean up before use
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for (std::size_t 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, std::size_t 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(std::size_t 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, std::size_t 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(std::size_t 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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