mirror of
https://gitlab.com/libeigen/eigen.git
synced 2024-12-15 07:10:37 +08:00
54 lines
2.0 KiB
C++
54 lines
2.0 KiB
C++
// 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
|