Eigen::DiagonalPreconditioner< _Scalar > Class Template Reference

A preconditioner based on the digonal entries. More...

#include <BasicPreconditioners.h>

Inheritance diagram for Eigen::DiagonalPreconditioner< _Scalar >:

Public Types
enum	{ ColsAtCompileTime = Dynamic, MaxColsAtCompileTime = Dynamic }
typedef Vector::StorageIndex	StorageIndex

Public Member Functions
template<typename Rhs , typename Dest >
void	_solve_impl (const Rhs &b, Dest &x) const
template<typename MatType >
DiagonalPreconditioner &	analyzePattern (const MatType &)
Index	cols () const
template<typename MatType >
DiagonalPreconditioner &	compute (const MatType &mat)
	DiagonalPreconditioner ()
template<typename MatType >
	DiagonalPreconditioner (const MatType &mat)
template<typename MatType >
DiagonalPreconditioner &	factorize (const MatType &mat)
ComputationInfo	info ()
Index	rows () const
template<typename Rhs >
const Solve< DiagonalPreconditioner, Rhs >	solve (const MatrixBase< Rhs > &b) const

Protected Attributes
Vector	m_invdiag
bool	m_isInitialized

Private Types
typedef _Scalar	Scalar
typedef Matrix< Scalar, Dynamic, 1 >	Vector

Detailed Description

template<typename _Scalar>
class Eigen::DiagonalPreconditioner< _Scalar >

A preconditioner based on the digonal entries.

This class allows to approximately solve for A.x = b problems assuming A is a diagonal matrix. In other words, this preconditioner neglects all off diagonal entries and, in Eigen's language, solves for:

A.diagonal().asDiagonal() . x = b

Template Parameters

_Scalar

the type of the scalar.

\implsparsesolverconcept

This preconditioner is suitable for both selfadjoint and general problems. The diagonal entries are pre-inverted and stored into a dense vector.

Note

A variant that has yet to be implemented would attempt to preserve the norm of each column.

See also

class LeastSquareDiagonalPreconditioner, class ConjugateGradient

Definition at line 36 of file BasicPreconditioners.h.

Member Typedef Documentation

Scalar

template<typename _Scalar >

typedef _Scalar Eigen::DiagonalPreconditioner< _Scalar >::Scalar

private

Definition at line 38 of file BasicPreconditioners.h.

StorageIndex

template<typename _Scalar >

typedef Vector::StorageIndex Eigen::DiagonalPreconditioner< _Scalar >::StorageIndex

Definition at line 41 of file BasicPreconditioners.h.

Vector

template<typename _Scalar >

typedef Matrix<Scalar,Dynamic,1> Eigen::DiagonalPreconditioner< _Scalar >::Vector

private

Definition at line 39 of file BasicPreconditioners.h.

Member Enumeration Documentation

anonymous enum

template<typename _Scalar >

anonymous enum

Enumerator
ColsAtCompileTime
MaxColsAtCompileTime

Definition at line 42 of file BasicPreconditioners.h.

Constructor & Destructor Documentation

DiagonalPreconditioner() [1/2]

template<typename _Scalar >

Eigen::DiagonalPreconditioner< _Scalar >::DiagonalPreconditioner ( )

inline

Definition at line 47 of file BasicPreconditioners.h.

DiagonalPreconditioner() [2/2]

template<typename _Scalar >

template<typename MatType >

Eigen::DiagonalPreconditioner< _Scalar >::DiagonalPreconditioner ( const MatType &  mat )

inlineexplicit

Definition at line 50 of file BasicPreconditioners.h.

Member Function Documentation

_solve_impl()

template<typename _Scalar >

template<typename Rhs , typename Dest >

void Eigen::DiagonalPreconditioner< _Scalar >::_solve_impl ( const Rhs &  b, Dest &  x  ) const

inline

Definition at line 89 of file BasicPreconditioners.h.

analyzePattern()

template<typename _Scalar >

template<typename MatType >

DiagonalPreconditioner& Eigen::DiagonalPreconditioner< _Scalar >::analyzePattern ( const MatType &  )

inline

Definition at line 59 of file BasicPreconditioners.h.

cols()

template<typename _Scalar >

Index Eigen::DiagonalPreconditioner< _Scalar >::cols ( ) const

inline

Definition at line 56 of file BasicPreconditioners.h.

compute()

template<typename _Scalar >

template<typename MatType >

DiagonalPreconditioner& Eigen::DiagonalPreconditioner< _Scalar >::compute ( const MatType &  mat )

inline

Definition at line 82 of file BasicPreconditioners.h.

factorize()

template<typename _Scalar >

template<typename MatType >

DiagonalPreconditioner& Eigen::DiagonalPreconditioner< _Scalar >::factorize ( const MatType &  mat )

inline

Definition at line 65 of file BasicPreconditioners.h.

info()

template<typename _Scalar >

ComputationInfo Eigen::DiagonalPreconditioner< _Scalar >::info ( )

inline

Definition at line 103 of file BasicPreconditioners.h.

rows()

template<typename _Scalar >

Index Eigen::DiagonalPreconditioner< _Scalar >::rows ( ) const

inline

Definition at line 55 of file BasicPreconditioners.h.

solve()

template<typename _Scalar >

template<typename Rhs >

const Solve<DiagonalPreconditioner, Rhs> Eigen::DiagonalPreconditioner< _Scalar >::solve ( const MatrixBase< Rhs > &  b ) const

inline

Definition at line 95 of file BasicPreconditioners.h.

Member Data Documentation

m_invdiag

template<typename _Scalar >

Vector Eigen::DiagonalPreconditioner< _Scalar >::m_invdiag

protected

Definition at line 106 of file BasicPreconditioners.h.

m_isInitialized

template<typename _Scalar >

bool Eigen::DiagonalPreconditioner< _Scalar >::m_isInitialized

protected

Definition at line 107 of file BasicPreconditioners.h.

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The documentation for this class was generated from the following file:

• BasicPreconditioners.h