GeneralRank1Update.h

// 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_GENERAL_RANK1UPDATE_H
#define EIGEN_GENERAL_RANK1UPDATE_H

namespace Eigen {
namespace internal {

/* Optimized matrix += alpha * uv' */
template <typename Scalar, typename Index, int StorageOrder, bool ConjLhs, bool ConjRhs>
struct general_rank1_update;

template <typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
struct general_rank1_update<Scalar, Index, ColMajor, ConjLhs, ConjRhs> {
  static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar 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 < cols; ++i)
      Map<Matrix<Scalar, Dynamic, 1> >(mat + stride * i, rows) += alpha * cj(v[i]) * ConjRhsType(OtherMap(u, rows));
  }
};

template <typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
struct general_rank1_update<Scalar, Index, RowMajor, ConjLhs, ConjRhs> {
  static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha) {
    general_rank1_update<Scalar, Index, ColMajor, ConjRhs, ConjRhs>::run(rows, cols, mat, stride, u, v, alpha);
  }
};

}  // namespace internal
}  // namespace Eigen

#endif  // EIGEN_GENERAL_RANK1UPDATE_H