45 lines
1.6 KiB
C++
45 lines
1.6 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2012 Chen-Pang He <jdh8@ms63.hinet.net>
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef EIGEN_GENERAL_RANK1UPDATE_H
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#define EIGEN_GENERAL_RANK1UPDATE_H
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namespace internal {
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/* Optimized matrix += alpha * uv' */
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template<typename Scalar, typename Index, int StorageOrder, bool ConjLhs, bool ConjRhs>
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struct general_rank1_update;
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template<typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
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struct general_rank1_update<Scalar,Index,ColMajor,ConjLhs,ConjRhs>
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{
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static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha)
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{
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typedef Map<const Matrix<Scalar,Dynamic,1> > OtherMap;
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typedef typename conj_expr_if<ConjLhs,OtherMap>::type ConjRhsType;
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conj_if<ConjRhs> cj;
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for (Index i=0; i<cols; ++i)
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Map<Matrix<Scalar,Dynamic,1> >(mat+stride*i,rows) += alpha * cj(v[i]) * ConjRhsType(OtherMap(u,rows));
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}
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};
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template<typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
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struct general_rank1_update<Scalar,Index,RowMajor,ConjLhs,ConjRhs>
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{
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static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha)
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{
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general_rank1_update<Scalar,Index,ColMajor,ConjRhs,ConjRhs>::run(rows,cols,mat,stride,u,v,alpha);
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}
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};
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} // end namespace internal
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#endif // EIGEN_GENERAL_RANK1UPDATE_H
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