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#ifndef _theplu_yat_utility_expression_scaled_matrix |
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#define _theplu_yat_utility_expression_scaled_matrix |
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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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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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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 "yat/utility/BasicMatrix.h" |
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#include "yat/utility/BLAS_utility.h" |
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#include "yat/utility/MatrixExpression.h" |
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#include <gsl/gsl_matrix.h> |
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namespace theplu { |
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namespace yat { |
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namespace utility { |
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namespace expression { |
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/// \cond IGNORE_DOXYGEN |
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template<class T> |
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class ScaledMatrix : public MatrixExpression<ScaledMatrix<T> > |
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{ |
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public: |
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ScaledMatrix(double factor, const BasicMatrix<T>& A) |
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: A_(A), factor_(factor) {} |
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size_t rows(void) const { return A_.rows(); } |
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size_t columns(void) const { return A_.columns(); } |
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double operator()(size_t i, size_t j) const |
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{ |
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return factor_ * A_(i, j); |
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} |
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const T& base(void) const |
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{ |
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return static_cast<const T&>(A_); |
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} |
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void calculate_matrix(gsl_matrix*& result) const |
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{ |
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detail::copy(result, A_.gsl_matrix_p()); |
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gsl_matrix_scale(result, factor_); |
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} |
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double factor(void) const |
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{ |
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return factor_; |
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} |
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private: |
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const BasicMatrix<T>& A_; |
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double factor_; |
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}; |
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/// \endcond |
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}}}} // of namespace expression, utility, yat, and theplu |
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#endif |