51 lines
2.1 KiB
C++
51 lines
2.1 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_SELFADJOINT_PACKED_PRODUCT_H
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#define EIGEN_SELFADJOINT_PACKED_PRODUCT_H
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namespace internal {
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/* Optimized matrix += alpha * uv'
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* The matrix is in packed form.
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*/
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template <typename Scalar, typename Index, int StorageOrder, int UpLo, bool ConjLhs, bool ConjRhs>
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struct selfadjoint_packed_rank1_update;
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template <typename Scalar, typename Index, int UpLo, bool ConjLhs, bool ConjRhs>
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struct selfadjoint_packed_rank1_update<Scalar, Index, ColMajor, UpLo, ConjLhs, ConjRhs> {
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typedef typename NumTraits<Scalar>::Real RealScalar;
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static void run(Index size, Scalar* mat, const Scalar* vec, RealScalar alpha) {
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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 < size; ++i) {
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Map<Matrix<Scalar, Dynamic, 1> >(mat, UpLo == Lower ? size - i : (i + 1)) +=
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alpha * cj(vec[i]) * ConjRhsType(OtherMap(vec + (UpLo == Lower ? i : 0), UpLo == Lower ? size - i : (i + 1)));
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// FIXME This should be handled outside.
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mat[UpLo == Lower ? 0 : i] = numext::real(mat[UpLo == Lower ? 0 : i]);
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mat += UpLo == Lower ? size - i : (i + 1);
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}
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}
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};
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template <typename Scalar, typename Index, int UpLo, bool ConjLhs, bool ConjRhs>
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struct selfadjoint_packed_rank1_update<Scalar, Index, RowMajor, UpLo, ConjLhs, ConjRhs> {
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typedef typename NumTraits<Scalar>::Real RealScalar;
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static void run(Index size, Scalar* mat, const Scalar* vec, RealScalar alpha) {
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selfadjoint_packed_rank1_update<Scalar, Index, ColMajor, UpLo == Lower ? Upper : Lower, ConjRhs, ConjLhs>::run(
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size, mat, vec, alpha);
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}
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};
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} // end namespace internal
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#endif // EIGEN_SELFADJOINT_PACKED_PRODUCT_H
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