1// This file is part of Eigen, a lightweight C++ template library
2// for linear algebra.
3//
4// Copyright (C) 2012 Chen-Pang He <jdh8@ms63.hinet.net>
5//
6// This Source Code Form is subject to the terms of the Mozilla
7// Public License v. 2.0. If a copy of the MPL was not distributed
8// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9
10#ifndef EIGEN_GENERAL_RANK1UPDATE_H
11#define EIGEN_GENERAL_RANK1UPDATE_H
12
13namespace internal {
14
15/* Optimized matrix += alpha * uv' */
16template<typename Scalar, typename Index, int StorageOrder, bool ConjLhs, bool ConjRhs>
17struct general_rank1_update;
18
19template<typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
20struct general_rank1_update<Scalar,Index,ColMajor,ConjLhs,ConjRhs>
21{
22  static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha)
23  {
24    typedef Map<const Matrix<Scalar,Dynamic,1> > OtherMap;
25    typedef typename conj_expr_if<ConjLhs,OtherMap>::type ConjRhsType;
26    conj_if<ConjRhs> cj;
27
28    for (Index i=0; i<cols; ++i)
29      Map<Matrix<Scalar,Dynamic,1> >(mat+stride*i,rows) += alpha * cj(v[i]) * ConjRhsType(OtherMap(u,rows));
30  }
31};
32
33template<typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
34struct general_rank1_update<Scalar,Index,RowMajor,ConjLhs,ConjRhs>
35{
36  static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha)
37  {
38    general_rank1_update<Scalar,Index,ColMajor,ConjRhs,ConjRhs>::run(rows,cols,mat,stride,u,v,alpha);
39  }
40};
41
42} // end namespace internal
43
44#endif // EIGEN_GENERAL_RANK1UPDATE_H
45