1 | // This file is part of Eigen, a lightweight C++ template library
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2 | // for linear algebra.
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3 | //
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4 | // Copyright (C) 2010 Gael Guennebaud <gael.guennebaud@inria.fr>
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5 | //
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6 | // This Source Code Form is subject to the terms of the Mozilla
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7 | // Public License v. 2.0. If a copy of the MPL was not distributed
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8 | // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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9 |
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10 | #ifndef EIGEN_SPARSE_SOLVE_H
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11 | #define EIGEN_SPARSE_SOLVE_H
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12 |
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13 | namespace Eigen {
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14 |
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15 | namespace internal {
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16 |
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17 | template<typename _DecompositionType, typename Rhs> struct sparse_solve_retval_base;
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18 | template<typename _DecompositionType, typename Rhs> struct sparse_solve_retval;
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19 |
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20 | template<typename DecompositionType, typename Rhs>
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21 | struct traits<sparse_solve_retval_base<DecompositionType, Rhs> >
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22 | {
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23 | typedef typename DecompositionType::MatrixType MatrixType;
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24 | typedef SparseMatrix<typename Rhs::Scalar, Rhs::Options, typename Rhs::Index> ReturnType;
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25 | };
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26 |
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27 | template<typename _DecompositionType, typename Rhs> struct sparse_solve_retval_base
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28 | : public ReturnByValue<sparse_solve_retval_base<_DecompositionType, Rhs> >
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29 | {
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30 | typedef typename remove_all<typename Rhs::Nested>::type RhsNestedCleaned;
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31 | typedef _DecompositionType DecompositionType;
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32 | typedef ReturnByValue<sparse_solve_retval_base> Base;
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33 | typedef typename Base::Index Index;
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34 |
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35 | sparse_solve_retval_base(const DecompositionType& dec, const Rhs& rhs)
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36 | : m_dec(dec), m_rhs(rhs)
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37 | {}
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38 |
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39 | inline Index rows() const { return m_dec.cols(); }
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40 | inline Index cols() const { return m_rhs.cols(); }
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41 | inline const DecompositionType& dec() const { return m_dec; }
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42 | inline const RhsNestedCleaned& rhs() const { return m_rhs; }
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43 |
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44 | template<typename Dest> inline void evalTo(Dest& dst) const
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45 | {
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46 | static_cast<const sparse_solve_retval<DecompositionType,Rhs>*>(this)->evalTo(dst);
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47 | }
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48 |
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49 | protected:
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50 | template<typename DestScalar, int DestOptions, typename DestIndex>
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51 | inline void defaultEvalTo(SparseMatrix<DestScalar,DestOptions,DestIndex>& dst) const
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52 | {
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53 | // we process the sparse rhs per block of NbColsAtOnce columns temporarily stored into a dense matrix.
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54 | static const int NbColsAtOnce = 4;
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55 | int rhsCols = m_rhs.cols();
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56 | int size = m_rhs.rows();
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57 | Eigen::Matrix<DestScalar,Dynamic,Dynamic> tmp(size,rhsCols);
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58 | Eigen::Matrix<DestScalar,Dynamic,Dynamic> tmpX(size,rhsCols);
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59 | for(int k=0; k<rhsCols; k+=NbColsAtOnce)
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60 | {
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61 | int actualCols = std::min<int>(rhsCols-k, NbColsAtOnce);
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62 | tmp.leftCols(actualCols) = m_rhs.middleCols(k,actualCols);
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63 | tmpX.leftCols(actualCols) = m_dec.solve(tmp.leftCols(actualCols));
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64 | dst.middleCols(k,actualCols) = tmpX.leftCols(actualCols).sparseView();
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65 | }
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66 | }
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67 | const DecompositionType& m_dec;
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68 | typename Rhs::Nested m_rhs;
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69 | };
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70 |
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71 | #define EIGEN_MAKE_SPARSE_SOLVE_HELPERS(DecompositionType,Rhs) \
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72 | typedef typename DecompositionType::MatrixType MatrixType; \
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73 | typedef typename MatrixType::Scalar Scalar; \
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74 | typedef typename MatrixType::RealScalar RealScalar; \
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75 | typedef typename MatrixType::Index Index; \
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76 | typedef Eigen::internal::sparse_solve_retval_base<DecompositionType,Rhs> Base; \
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77 | using Base::dec; \
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78 | using Base::rhs; \
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79 | using Base::rows; \
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80 | using Base::cols; \
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81 | sparse_solve_retval(const DecompositionType& dec, const Rhs& rhs) \
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82 | : Base(dec, rhs) {}
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83 |
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84 |
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85 |
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86 | template<typename DecompositionType, typename Rhs, typename Guess> struct solve_retval_with_guess;
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87 |
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88 | template<typename DecompositionType, typename Rhs, typename Guess>
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89 | struct traits<solve_retval_with_guess<DecompositionType, Rhs, Guess> >
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90 | {
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91 | typedef typename DecompositionType::MatrixType MatrixType;
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92 | typedef Matrix<typename Rhs::Scalar,
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93 | MatrixType::ColsAtCompileTime,
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94 | Rhs::ColsAtCompileTime,
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95 | Rhs::PlainObject::Options,
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96 | MatrixType::MaxColsAtCompileTime,
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97 | Rhs::MaxColsAtCompileTime> ReturnType;
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98 | };
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99 |
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100 | template<typename DecompositionType, typename Rhs, typename Guess> struct solve_retval_with_guess
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101 | : public ReturnByValue<solve_retval_with_guess<DecompositionType, Rhs, Guess> >
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102 | {
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103 | typedef typename DecompositionType::Index Index;
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104 |
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105 | solve_retval_with_guess(const DecompositionType& dec, const Rhs& rhs, const Guess& guess)
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106 | : m_dec(dec), m_rhs(rhs), m_guess(guess)
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107 | {}
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108 |
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109 | inline Index rows() const { return m_dec.cols(); }
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110 | inline Index cols() const { return m_rhs.cols(); }
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111 |
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112 | template<typename Dest> inline void evalTo(Dest& dst) const
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113 | {
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114 | dst = m_guess;
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115 | m_dec._solveWithGuess(m_rhs,dst);
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116 | }
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117 |
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118 | protected:
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119 | const DecompositionType& m_dec;
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120 | const typename Rhs::Nested m_rhs;
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121 | const typename Guess::Nested m_guess;
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122 | };
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123 |
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124 | } // namepsace internal
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125 |
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126 | } // end namespace Eigen
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127 |
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128 | #endif // EIGEN_SPARSE_SOLVE_H
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