PreconditionPSOR< MatrixType > Class Template Reference

#include <deal.II/lac/precondition.h>

Inheritance diagram for PreconditionPSOR< MatrixType >:

Classes
class	AdditionalData

Public Types
typedef MatrixType::size_type	size_type
Public Types inherited from PreconditionRelaxation< MatrixType >
typedef MatrixType::size_type	size_type

Public Member Functions
void	initialize (const MatrixType &A, const std::vector< size_type > &permutation, const std::vector< size_type > &inverse_permutation, const typename PreconditionRelaxation< MatrixType >::AdditionalData &parameters=typename PreconditionRelaxation< MatrixType >::AdditionalData())
void	initialize (const MatrixType &A, const AdditionalData &additional_data)
template<class VectorType >
void	vmult (VectorType &, const VectorType &) const
template<class VectorType >
void	Tvmult (VectorType &, const VectorType &) const
Public Member Functions inherited from PreconditionRelaxation< MatrixType >
void	initialize (const MatrixType &A, const AdditionalData &parameters=AdditionalData())
void	clear ()
size_type	m () const
size_type	n () const
Public Member Functions inherited from Subscriptor
	Subscriptor ()
	Subscriptor (const Subscriptor &)
	Subscriptor (Subscriptor &&) noexcept
virtual	~Subscriptor ()
Subscriptor &	operator= (const Subscriptor &)
Subscriptor &	operator= (Subscriptor &&) noexcept
void	subscribe (const char *identifier=nullptr) const
void	unsubscribe (const char *identifier=nullptr) const
unsigned int	n_subscriptions () const
void	list_subscribers () const
template<class Archive >
void	serialize (Archive &ar, const unsigned int version)

Private Attributes
const std::vector< size_type > *	permutation
const std::vector< size_type > *	inverse_permutation

Additional Inherited Members
Static Public Member Functions inherited from Subscriptor
static ::ExceptionBase &	ExcInUse (int arg1, std::string arg2, std::string arg3)
static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)
Protected Attributes inherited from PreconditionRelaxation< MatrixType >
SmartPointer< const MatrixType, PreconditionRelaxation< MatrixType > >	A
double	relaxation

Detailed Description

template<typename MatrixType = SparseMatrix<double>>
class PreconditionPSOR< MatrixType >

Permuted SOR preconditioner using matrix built-in function. The MatrixType class used is required to have functions PSOR(VectorType&, const VectorType&, double) and TPSOR(VectorType&, const VectorType&, double).

    // Declare related objects

SparseMatrix<double> A;
Vector<double> x;
Vector<double> b;
SolverCG<> solver(...);

//...initialize and build A

std::vector<unsigned int> permutation(x.size());
std::vector<unsigned int> inverse_permutation(x.size());

//...fill permutation and its inverse with reasonable values

    // Define and initialize preconditioner

PreconditionPSOR<SparseMatrix<double> > precondition;
precondition.initialize (A, permutation, inverse_permutation, .6);

solver.solve (A, x, b, precondition);

Author

Guido Kanschat, 2003; extension for full compatibility with LinearOperator class: Jean-Paul Pelteret, 2015

Definition at line 716 of file precondition.h.

Member Typedef Documentation

size_type

template<typename MatrixType = SparseMatrix<double>>

typedef MatrixType::size_type PreconditionPSOR< MatrixType >::size_type

Declare type for container size.

Definition at line 722 of file precondition.h.

Member Function Documentation

initialize() [1/2]

template<typename MatrixType = SparseMatrix<double>>

void PreconditionPSOR< MatrixType >::initialize	(	const MatrixType &	A,
		const std::vector< size_type > &	permutation,
		const std::vector< size_type > &	inverse_permutation,
		const typename PreconditionRelaxation< MatrixType >::AdditionalData &	parameters = typename PreconditionRelaxation< MatrixType >::AdditionalData()
	)

Initialize matrix and relaxation parameter. The matrix is just stored in the preconditioner object.

The permutation vector is stored as a pointer. Therefore, it has to be assured that the lifetime of the vector exceeds the lifetime of the preconditioner.

The relaxation parameter should be larger than zero and smaller than 2 for numerical reasons. It defaults to 1.

initialize() [2/2]

template<typename MatrixType = SparseMatrix<double>>

void PreconditionPSOR< MatrixType >::initialize	(	const MatrixType &	A,
		const AdditionalData &	additional_data
	)

Initialize matrix and relaxation parameter. The matrix is just stored in the preconditioner object.

For more detail about possible parameters, see the class documentation and the documentation of the PreconditionPSOR::AdditionalData class.

After this function is called the preconditioner is ready to be used (using the vmult function of derived classes).

vmult()

template<typename MatrixType = SparseMatrix<double>>

template<class VectorType >

void PreconditionPSOR< MatrixType >::vmult	(	VectorType &	,
		const VectorType &
	)		const

Apply preconditioner.

Tvmult()

template<typename MatrixType = SparseMatrix<double>>

template<class VectorType >

void PreconditionPSOR< MatrixType >::Tvmult	(	VectorType &	,
		const VectorType &
	)		const

Apply transpose preconditioner.

Member Data Documentation

permutation

template<typename MatrixType = SparseMatrix<double>>

const std::vector<size_type>* PreconditionPSOR< MatrixType >::permutation

private

Storage for the permutation vector.

Definition at line 804 of file precondition.h.

inverse_permutation

template<typename MatrixType = SparseMatrix<double>>

const std::vector<size_type>* PreconditionPSOR< MatrixType >::inverse_permutation

private

Storage for the inverse permutation vector.

Definition at line 808 of file precondition.h.

---

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

• deal.II/lac/precondition.h