ground/gcs/src/libs/eigen/blas/PackedSelfadjointProduct.h

   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_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