17faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez// This file is part of Eigen, a lightweight C++ template library 27faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez// for linear algebra. 37faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez// 47faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez// Copyright (C) 2012 Chen-Pang He <jdh8@ms63.hinet.net> 57faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez// 67faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez// This Source Code Form is subject to the terms of the Mozilla 77faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez// Public License v. 2.0. If a copy of the MPL was not distributed 87faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez// with this file, You can obtain one at http://mozilla.org/MPL/2.0/. 97faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez 107faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez#ifndef EIGEN_RANK2UPDATE_H 117faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez#define EIGEN_RANK2UPDATE_H 127faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez 137faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandeznamespace internal { 147faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez 157faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez/* Optimized selfadjoint matrix += alpha * uv' + conj(alpha)*vu' 167faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez * This is the low-level version of SelfadjointRank2Update.h 177faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez */ 187faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandeztemplate<typename Scalar, typename Index, int UpLo> 197faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandezstruct rank2_update_selector 207faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez{ 217faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez static void run(Index size, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha) 227faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez { 237faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez typedef Map<const Matrix<Scalar,Dynamic,1> > OtherMap; 247faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez for (Index i=0; i<size; ++i) 257faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez { 267faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez Map<Matrix<Scalar,Dynamic,1> >(mat+stride*i+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)) += 277faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez numext::conj(alpha) * numext::conj(u[i]) * OtherMap(v+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)) 287faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez + alpha * numext::conj(v[i]) * OtherMap(u+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)); 297faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez } 307faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez } 317faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez}; 327faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez 337faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez/* Optimized selfadjoint matrix += alpha * uv' + conj(alpha)*vu' 347faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez * The matrix is in packed form. 357faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez */ 367faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandeztemplate<typename Scalar, typename Index, int UpLo> 377faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandezstruct packed_rank2_update_selector 387faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez{ 397faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez static void run(Index size, Scalar* mat, const Scalar* u, const Scalar* v, Scalar alpha) 407faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez { 417faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez typedef Map<const Matrix<Scalar,Dynamic,1> > OtherMap; 427faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez Index offset = 0; 437faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez for (Index i=0; i<size; ++i) 447faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez { 457faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez Map<Matrix<Scalar,Dynamic,1> >(mat+offset, UpLo==Lower ? size-i : (i+1)) += 467faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez numext::conj(alpha) * numext::conj(u[i]) * OtherMap(v+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)) 477faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez + alpha * numext::conj(v[i]) * OtherMap(u+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)); 487faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez //FIXME This should be handled outside. 497faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez mat[offset+(UpLo==Lower ? 0 : i)] = numext::real(mat[offset+(UpLo==Lower ? 0 : i)]); 507faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez offset += UpLo==Lower ? size-i : (i+1); 517faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez } 527faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez } 537faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez}; 547faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez 557faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez} // end namespace internal 567faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez 577faaa9f3f0df9d23790277834d426c3d992ac3baCarlos Hernandez#endif // EIGEN_RANK2UPDATE_H 58