PreconditionPSOR< MATRIX > Class Template Reference

#include <precondition.h>

Inheritance diagram for PreconditionPSOR< MATRIX >:

Public Types
typedef types::global_dof_index	size_type

Public Member Functions
void	initialize (const MATRIX &A, const std::vector< size_type > &permutation, const std::vector< size_type > &inverse_permutation, const typename PreconditionRelaxation< MATRIX >::AdditionalData &parameters=typename PreconditionRelaxation< MATRIX >::AdditionalData())
template<class VECTOR >
void	vmult (VECTOR &, const VECTOR &) const
template<class VECTOR >
void	Tvmult (VECTOR &, const VECTOR &) const
Public Member Functions inherited from PreconditionRelaxation< MATRIX >
void	initialize (const MATRIX &A, const AdditionalData &parameters=AdditionalData())
void	clear ()
Public Member Functions inherited from Subscriptor
	Subscriptor ()
	Subscriptor (const Subscriptor &)
virtual	~Subscriptor ()
Subscriptor &	operator= (const Subscriptor &)
void	subscribe (const char *identifier=0) const
void	unsubscribe (const char *identifier=0) const
unsigned int	n_subscriptions () const
void	list_subscribers () const
	DeclException3 (ExcInUse, int, char *, std::string &,<< "Object of class "<< arg2<< " is still used by "<< arg1<< " other objects.\n"<< "(Additional information: "<< arg3<< ")\n"<< "Note the entry in the Frequently Asked Questions of "<< "deal.II (linked to from http://www.dealii.org/) for "<< "more information on what this error means.")
	DeclException2 (ExcNoSubscriber, char *, char *,<< "No subscriber with identifier \""<< arg2<< "\" did subscribe to this object of class "<< arg1)
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
Protected Attributes inherited from PreconditionRelaxation< MATRIX >
SmartPointer< const MATRIX, PreconditionRelaxation< MATRIX > >	A
double	relaxation

Detailed Description

template<class MATRIX = SparseMatrix<double>>
class PreconditionPSOR< MATRIX >

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

Definition at line 679 of file precondition.h.

Member Typedef Documentation

template<class MATRIX = SparseMatrix<double>>

typedef types::global_dof_index PreconditionPSOR< MATRIX >::size_type

Declare type for container size.

Definition at line 685 of file precondition.h.

Member Function Documentation

template<class MATRIX = SparseMatrix<double>>

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

template<class MATRIX = SparseMatrix<double>>

template<class VECTOR >

void PreconditionPSOR< MATRIX >::vmult	(	VECTOR &	,
		const VECTOR &
	)		const

Apply preconditioner.

template<class MATRIX = SparseMatrix<double>>

template<class VECTOR >

void PreconditionPSOR< MATRIX >::Tvmult	(	VECTOR &	,
		const VECTOR &
	)		const

Apply transpose preconditioner.

Member Data Documentation

template<class MATRIX = SparseMatrix<double>>

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

private

Storage for the permutation vector.

Definition at line 728 of file precondition.h.

template<class MATRIX = SparseMatrix<double>>

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

private

Storage for the inverse permutation vector.

Definition at line 733 of file precondition.h.

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

• include/deal.II/lac/precondition.h