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#ifndef _theplu_yat_utility_expression_matrix_product |
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#define _theplu_yat_utility_expression_matrix_product |
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// $Id$ |
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/* |
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Copyright (C) 2020 Peter Johansson |
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This file is part of the yat library, http://dev.thep.lu.se/yat |
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|
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The yat library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License as |
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published by the Free Software Foundation; either version 3 of the |
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License, or (at your option) any later version. |
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The yat 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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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with yat. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#include "MatrixTraits.h" |
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#include "ScaledMatrix.h" |
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#include "TransposedMatrix.h" |
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#include "yat/utility/BasicMatrix.h" |
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#include "yat/utility/MatrixExpression.h" |
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#include "yat/utility/yat_assert.h" |
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|
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#include <gsl/gsl_blas_types.h> |
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#include <gsl/gsl_blas.h> |
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#include <gsl/gsl_cblas.h> |
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#include <gsl/gsl_matrix.h> |
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|
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namespace theplu { |
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namespace yat { |
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namespace utility { |
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/// \cond IGNORE_DOXYGEN |
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namespace expression { |
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template<class MATRIX1, class MATRIX2> |
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class MatrixProduct : public MatrixExpression<MatrixProduct<MATRIX1,MATRIX2> > |
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{ |
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public: |
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MatrixProduct(const MATRIX1& A, const MATRIX2& B) |
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: A_(A), B_(B) {} |
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size_t rows(void) const { return A_.rows(); } |
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size_t columns(void) const { return B_.columns(); } |
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|
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double operator()(size_t row, size_t column) const |
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{ return gsl_matrix_get(this->gsl_matrix_p(), row, column); } |
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|
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void calculate_matrix(gsl_matrix*& result) const |
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{ |
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detail::reallocate(result, this->rows(), this->columns()); |
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YAT_ASSERT(detail::rows(result) == this->rows()); |
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YAT_ASSERT(detail::columns(result) == this->columns()); |
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YAT_ASSERT(A_.columns() == B_.rows()); |
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MatrixTraits<MATRIX1> traits1; |
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MatrixTraits<MATRIX2> traits2; |
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gsl_blas_dgemm(traits1.transpose_type(), traits2.transpose_type(), |
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traits1.factor(A_) * traits2.factor(B_), |
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traits1.get_gsl_matrix_p(A_), |
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traits2.get_gsl_matrix_p(B_), |
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0.0, result); |
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YAT_ASSERT(result); |
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} |
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private: |
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const MATRIX1& A_; |
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const MATRIX2& B_; |
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}; |
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} // end namespace expression |
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/// \endcond |
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}}} // of namespace utility, yat, and theplu |
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|
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#endif |