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 (at) 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_SELFADJOINT_PACKED_PRODUCT_H 11 #define EIGEN_SELFADJOINT_PACKED_PRODUCT_H 12 13 namespace internal { 14 15 /* Optimized matrix += alpha * uv' 16 * The matrix is in packed form. 17 */ 18 template<typename Scalar, typename Index, int StorageOrder, int UpLo, bool ConjLhs, bool ConjRhs> 19 struct selfadjoint_packed_rank1_update; 20 21 template<typename Scalar, typename Index, int UpLo, bool ConjLhs, bool ConjRhs> 22 struct selfadjoint_packed_rank1_update<Scalar,Index,ColMajor,UpLo,ConjLhs,ConjRhs> 23 { 24 typedef typename NumTraits<Scalar>::Real RealScalar; 25 static void run(Index size, Scalar* mat, const Scalar* vec, RealScalar alpha) 26 { 27 typedef Map<const Matrix<Scalar,Dynamic,1> > OtherMap; 28 typedef typename conj_expr_if<ConjLhs,OtherMap>::type ConjRhsType; 29 conj_if<ConjRhs> cj; 30 31 for (Index i=0; i<size; ++i) 32 { 33 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))); 34 //FIXME This should be handled outside. 35 mat[UpLo==Lower ? 0 : i] = numext::real(mat[UpLo==Lower ? 0 : i]); 36 mat += UpLo==Lower ? size-i : (i+1); 37 } 38 } 39 }; 40 41 template<typename Scalar, typename Index, int UpLo, bool ConjLhs, bool ConjRhs> 42 struct selfadjoint_packed_rank1_update<Scalar,Index,RowMajor,UpLo,ConjLhs,ConjRhs> 43 { 44 typedef typename NumTraits<Scalar>::Real RealScalar; 45 static void run(Index size, Scalar* mat, const Scalar* vec, RealScalar alpha) 46 { 47 selfadjoint_packed_rank1_update<Scalar,Index,ColMajor,UpLo==Lower?Upper:Lower,ConjRhs,ConjLhs>::run(size,mat,vec,alpha); 48 } 49 }; 50 51 } // end namespace internal 52 53 #endif // EIGEN_SELFADJOINT_PACKED_PRODUCT_H 54
