| Carlos Hernandez | 7faaa9f | 2014-08-05 17:53:32 -0700 | [diff] [blame] | 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_RANK2UPDATE_H |
| 11 | #define EIGEN_RANK2UPDATE_H |
| 12 | |
| 13 | namespace internal { |
| 14 | |
| 15 | /* Optimized selfadjoint matrix += alpha * uv' + conj(alpha)*vu' |
| 16 | * This is the low-level version of SelfadjointRank2Update.h |
| 17 | */ |
| 18 | template<typename Scalar, typename Index, int UpLo> |
| 19 | struct rank2_update_selector |
| 20 | { |
| 21 | static void run(Index size, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha) |
| 22 | { |
| 23 | typedef Map<const Matrix<Scalar,Dynamic,1> > OtherMap; |
| 24 | for (Index i=0; i<size; ++i) |
| 25 | { |
| 26 | Map<Matrix<Scalar,Dynamic,1> >(mat+stride*i+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)) += |
| 27 | numext::conj(alpha) * numext::conj(u[i]) * OtherMap(v+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)) |
| 28 | + alpha * numext::conj(v[i]) * OtherMap(u+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)); |
| 29 | } |
| 30 | } |
| 31 | }; |
| 32 | |
| 33 | /* Optimized selfadjoint matrix += alpha * uv' + conj(alpha)*vu' |
| 34 | * The matrix is in packed form. |
| 35 | */ |
| 36 | template<typename Scalar, typename Index, int UpLo> |
| 37 | struct packed_rank2_update_selector |
| 38 | { |
| 39 | static void run(Index size, Scalar* mat, const Scalar* u, const Scalar* v, Scalar alpha) |
| 40 | { |
| 41 | typedef Map<const Matrix<Scalar,Dynamic,1> > OtherMap; |
| 42 | Index offset = 0; |
| 43 | for (Index i=0; i<size; ++i) |
| 44 | { |
| 45 | Map<Matrix<Scalar,Dynamic,1> >(mat+offset, UpLo==Lower ? size-i : (i+1)) += |
| 46 | numext::conj(alpha) * numext::conj(u[i]) * OtherMap(v+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)) |
| 47 | + alpha * numext::conj(v[i]) * OtherMap(u+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)); |
| 48 | //FIXME This should be handled outside. |
| 49 | mat[offset+(UpLo==Lower ? 0 : i)] = numext::real(mat[offset+(UpLo==Lower ? 0 : i)]); |
| 50 | offset += UpLo==Lower ? size-i : (i+1); |
| 51 | } |
| 52 | } |
| 53 | }; |
| 54 | |
| 55 | } // end namespace internal |
| 56 | |
| 57 | #endif // EIGEN_RANK2UPDATE_H |