PETScWrappers::PreconditionerBase Class Reference

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

Inheritance diagram for PETScWrappers::PreconditionerBase:

Public Member Functions
	PreconditionerBase ()
virtual	~PreconditionerBase ()
void	clear ()
void	vmult (VectorBase &dst, const VectorBase &src) const
const PC &	get_pc () const

Protected Member Functions
void	create_pc ()
	operator Mat () const

Protected Attributes
PC	pc
Mat	matrix

Friends
class	SolverBase

Detailed Description

Base class for preconditioner classes using the PETSc functionality. The classes in this hierarchy don't do a whole lot, except for providing a function that sets the preconditioner and certain parameters on the preconditioning context of the solver. These classes are basically here only to allow a similar interface as already used for the deal.II solver and preconditioner classes.

Note that derived classes only provide interfaces to the relevant functionality of PETSc. PETSc does not implement all preconditioners for all matrix types. In particular, some preconditioners are not going to work for parallel jobs, such as for example the ILU preconditioner.

Author

Wolfgang Bangerth, Timo Heister, 2004, 2011

Definition at line 55 of file petsc_precondition.h.

Constructor & Destructor Documentation

PreconditionerBase()

PETScWrappers::PreconditionerBase::PreconditionerBase

(

)

Constructor.

Definition at line 33 of file petsc_precondition.cc.

~PreconditionerBase()

PETScWrappers::PreconditionerBase::~PreconditionerBase ( )

virtual

Destructor.

Definition at line 38 of file petsc_precondition.cc.

Member Function Documentation

clear()

void PETScWrappers::PreconditionerBase::clear

(

)

Destroys the preconditioner, leaving an object like just after having called the constructor.

Definition at line 49 of file petsc_precondition.cc.

vmult()

void PETScWrappers::PreconditionerBase::vmult	(	VectorBase &	dst,
		const VectorBase &	src
	)		const

Apply the preconditioner once to the given src vector.

Definition at line 67 of file petsc_precondition.cc.

get_pc()

const PC & PETScWrappers::PreconditionerBase::get_pc

(

)

const

Gives access to the underlying PETSc object.

Definition at line 105 of file petsc_precondition.cc.

create_pc()

void PETScWrappers::PreconditionerBase::create_pc ( )

protected

Internal function to create the PETSc preconditioner object. Fails if called twice.

Definition at line 78 of file petsc_precondition.cc.

operator Mat()

PETScWrappers::PreconditionerBase::operator Mat ( ) const

protected

Conversion operator to get a representation of the matrix that represents this preconditioner. We use this inside the actual solver, where we need to pass this matrix to the PETSc solvers.

Definition at line 111 of file petsc_precondition.cc.

Friends And Related Function Documentation

SolverBase

friend class SolverBase

friend

Make the solver class a friend, since it needs to call the conversion operator.

Definition at line 114 of file petsc_precondition.h.

Member Data Documentation

pc

PC PETScWrappers::PreconditionerBase::pc

protected

the PETSc preconditioner object

Definition at line 90 of file petsc_precondition.h.

matrix

Mat PETScWrappers::PreconditionerBase::matrix

protected

A pointer to the matrix that acts as a preconditioner.

Definition at line 95 of file petsc_precondition.h.

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

• deal.II/lac/petsc_precondition.h
• source/lac/petsc_precondition.cc