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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2012 Chen-Pang He <jdh8@ms63.hinet.net>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef EIGEN_SELFADJOINT_PACKED_PRODUCT_H
#define EIGEN_SELFADJOINT_PACKED_PRODUCT_H
namespace internal {
/* Optimized matrix += alpha * uv'
* The matrix is in packed form.
*/
template <typename Scalar, typename Index, int StorageOrder, int UpLo, bool ConjLhs, bool ConjRhs>
struct selfadjoint_packed_rank1_update;
template <typename Scalar, typename Index, int UpLo, bool ConjLhs, bool ConjRhs>
struct selfadjoint_packed_rank1_update<Scalar, Index, ColMajor, UpLo, ConjLhs, ConjRhs> {
typedef typename NumTraits<Scalar>::Real RealScalar;
static void run(Index size, Scalar* mat, const Scalar* vec, RealScalar alpha) {
typedef Map<const Matrix<Scalar, Dynamic, 1> > OtherMap;
typedef typename conj_expr_if<ConjLhs, OtherMap>::type ConjRhsType;
conj_if<ConjRhs> cj;
for (Index i = 0; i < size; ++i) {
Map<Matrix<Scalar, Dynamic, 1> >(mat, UpLo == Lower ? size - i : (i + 1)) +=
alpha * cj(vec[i]) * ConjRhsType(OtherMap(vec + (UpLo == Lower ? i : 0), UpLo == Lower ? size - i : (i + 1)));
// FIXME This should be handled outside.
mat[UpLo == Lower ? 0 : i] = numext::real(mat[UpLo == Lower ? 0 : i]);
mat += UpLo == Lower ? size - i : (i + 1);
}
}
};
template <typename Scalar, typename Index, int UpLo, bool ConjLhs, bool ConjRhs>
struct selfadjoint_packed_rank1_update<Scalar, Index, RowMajor, UpLo, ConjLhs, ConjRhs> {
typedef typename NumTraits<Scalar>::Real RealScalar;
static void run(Index size, Scalar* mat, const Scalar* vec, RealScalar alpha) {
selfadjoint_packed_rank1_update<Scalar, Index, ColMajor, UpLo == Lower ? Upper : Lower, ConjRhs, ConjLhs>::run(
size, mat, vec, alpha);
}
};
} // end namespace internal
#endif // EIGEN_SELFADJOINT_PACKED_PRODUCT_H