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Eigen  3.4.0
 
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SolveWithGuess.h
1// This file is part of Eigen, a lightweight C++ template library
2// for linear algebra.
3//
4// Copyright (C) 2014 Gael Guennebaud <gael.guennebaud@inria.fr>
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_SOLVEWITHGUESS_H
11#define EIGEN_SOLVEWITHGUESS_H
12
13namespace Eigen {
14
15template<typename Decomposition, typename RhsType, typename GuessType> class SolveWithGuess;
16
29namespace internal {
30
31
32template<typename Decomposition, typename RhsType, typename GuessType>
33struct traits<SolveWithGuess<Decomposition, RhsType, GuessType> >
34 : traits<Solve<Decomposition,RhsType> >
35{};
36
37}
38
39
40template<typename Decomposition, typename RhsType, typename GuessType>
41class SolveWithGuess : public internal::generic_xpr_base<SolveWithGuess<Decomposition,RhsType,GuessType>, MatrixXpr, typename internal::traits<RhsType>::StorageKind>::type
42{
43public:
44 typedef typename internal::traits<SolveWithGuess>::Scalar Scalar;
45 typedef typename internal::traits<SolveWithGuess>::PlainObject PlainObject;
46 typedef typename internal::generic_xpr_base<SolveWithGuess<Decomposition,RhsType,GuessType>, MatrixXpr, typename internal::traits<RhsType>::StorageKind>::type Base;
47 typedef typename internal::ref_selector<SolveWithGuess>::type Nested;
48
49 SolveWithGuess(const Decomposition &dec, const RhsType &rhs, const GuessType &guess)
50 : m_dec(dec), m_rhs(rhs), m_guess(guess)
51 {}
52
53 EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
54 Index rows() const EIGEN_NOEXCEPT { return m_dec.cols(); }
55 EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
56 Index cols() const EIGEN_NOEXCEPT { return m_rhs.cols(); }
57
58 EIGEN_DEVICE_FUNC const Decomposition& dec() const { return m_dec; }
59 EIGEN_DEVICE_FUNC const RhsType& rhs() const { return m_rhs; }
60 EIGEN_DEVICE_FUNC const GuessType& guess() const { return m_guess; }
61
62protected:
63 const Decomposition &m_dec;
64 const RhsType &m_rhs;
65 const GuessType &m_guess;
66
67private:
68 Scalar coeff(Index row, Index col) const;
69 Scalar coeff(Index i) const;
70};
71
72namespace internal {
73
74// Evaluator of SolveWithGuess -> eval into a temporary
75template<typename Decomposition, typename RhsType, typename GuessType>
76struct evaluator<SolveWithGuess<Decomposition,RhsType, GuessType> >
77 : public evaluator<typename SolveWithGuess<Decomposition,RhsType,GuessType>::PlainObject>
78{
80 typedef typename SolveType::PlainObject PlainObject;
81 typedef evaluator<PlainObject> Base;
82
83 evaluator(const SolveType& solve)
84 : m_result(solve.rows(), solve.cols())
85 {
86 ::new (static_cast<Base*>(this)) Base(m_result);
87 m_result = solve.guess();
88 solve.dec()._solve_with_guess_impl(solve.rhs(), m_result);
89 }
90
91protected:
92 PlainObject m_result;
93};
94
95// Specialization for "dst = dec.solveWithGuess(rhs)"
96// NOTE we need to specialize it for Dense2Dense to avoid ambiguous specialization error and a Sparse2Sparse specialization must exist somewhere
97template<typename DstXprType, typename DecType, typename RhsType, typename GuessType, typename Scalar>
98struct Assignment<DstXprType, SolveWithGuess<DecType,RhsType,GuessType>, internal::assign_op<Scalar,Scalar>, Dense2Dense>
99{
101 static void run(DstXprType &dst, const SrcXprType &src, const internal::assign_op<Scalar,Scalar> &)
102 {
103 Index dstRows = src.rows();
104 Index dstCols = src.cols();
105 if((dst.rows()!=dstRows) || (dst.cols()!=dstCols))
106 dst.resize(dstRows, dstCols);
107
108 dst = src.guess();
109 src.dec()._solve_with_guess_impl(src.rhs(), dst/*, src.guess()*/);
110 }
111};
112
113} // end namespace internal
114
115} // end namespace Eigen
116
117#endif // EIGEN_SOLVEWITHGUESS_H
Pseudo expression representing a solving operation.
Definition: SolveWithGuess.h:42
Namespace containing all symbols from the Eigen library.
Definition: Core:141
EIGEN_DEFAULT_DENSE_INDEX_TYPE Index
The Index type as used for the API.
Definition: Meta.h:74
Definition: Constants.h:522