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author | Chen-Pang He <jdh8@ms63.hinet.net> | 2012-09-08 01:39:16 +0800 |
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committer | Chen-Pang He <jdh8@ms63.hinet.net> | 2012-09-08 01:39:16 +0800 |
commit | b0b9b4d6b223cfbfee564427514cd6d693e1c503 (patch) | |
tree | ff3da7a5bf23f79dd48e1c3ff5e1e17ef517dab9 /blas/GeneralRank1Update.h | |
parent | 145f89cd5f8872bfe8bceae127a2421576767e08 (diff) |
Implement functors for rank-1 and rank-2 update.
Diffstat (limited to 'blas/GeneralRank1Update.h')
-rw-r--r-- | blas/GeneralRank1Update.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/blas/GeneralRank1Update.h b/blas/GeneralRank1Update.h new file mode 100644 index 000000000..a3301ed92 --- /dev/null +++ b/blas/GeneralRank1Update.h @@ -0,0 +1,30 @@ +// 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 internal { + +/* Optimized matrix += alpha * uv' */ +template<typename Scalar, typename Index, bool ConjRhs> +struct general_rank1_update +{ + static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha) + { + typedef Matrix<Scalar,Dynamic,1> PlainVector; + internal::conj_if<ConjRhs> cj; + for (Index i=0; i<cols; ++i) + Map<PlainVector>(mat+stride*i,rows) += alpha * cj(v[i]) * Map<const PlainVector>(u,rows); + } +}; + +} // end namespace internal + +#endif // EIGEN_GENERAL_RANK1UPDATE_H |