PETScWrappers::PreconditionLU Class Reference

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

Inheritance diagram for PETScWrappers::PreconditionLU:

Classes
struct	AdditionalData

Public Member Functions
	PreconditionLU ()=default
	PreconditionLU (const MatrixBase &matrix, const AdditionalData &additional_data=AdditionalData())
void	initialize (const MatrixBase &matrix, const AdditionalData &additional_data=AdditionalData())
Public Member Functions inherited from PETScWrappers::PreconditionerBase
	PreconditionerBase ()
virtual	~PreconditionerBase ()
void	clear ()
void	vmult (VectorBase &dst, const VectorBase &src) const
const PC &	get_pc () const

Protected Attributes
AdditionalData	additional_data
Protected Attributes inherited from PETScWrappers::PreconditionerBase
PC	pc
Mat	matrix

Additional Inherited Members
Protected Member Functions inherited from PETScWrappers::PreconditionerBase
void	create_pc ()
	operator Mat () const

Detailed Description

A class that implements the interface to use the PETSc LU preconditioner (PCLU). Unlike classes like PreconditionILU, this class usually (depending on the settings) performs an exact factorization of the matrix, so it is not necessary to wrap it in an iterative solver. This class is typically used with SolverPreOnly to get a direct solver. Alternatively, you can use PreconditionerBase::vmult() directly.

Note

This is not a parallel preconditioner so it only works in serial computations with a single processor.

Author

Oliver Kayser-Herold, 2004

Definition at line 601 of file petsc_precondition.h.

Constructor & Destructor Documentation

PETScWrappers::PreconditionLU::PreconditionLU ( )

default

Empty Constructor. You need to call initialize() before using this object.

PreconditionLU< number >::PreconditionLU	(	const MatrixBase &	matrix,
		const AdditionalData &	additional_data = AdditionalData()
	)

Constructor. Take the matrix which is used to form the preconditioner, and additional flags if there are any.

Definition at line 701 of file petsc_precondition.cc.

Member Function Documentation

void PreconditionLU< number >::initialize	(	const MatrixBase &	matrix,
		const AdditionalData &	additional_data = AdditionalData()
	)

Initialize the preconditioner object and calculate all data that is necessary for applying it in a solver. This function is automatically called when calling the constructor with the same arguments and is only used if you create the preconditioner without arguments.

Definition at line 709 of file petsc_precondition.cc.

Member Data Documentation

AdditionalData PETScWrappers::PreconditionLU::additional_data

protected

Store a copy of the flags for this particular preconditioner.

Definition at line 665 of file petsc_precondition.h.

---

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

• deal.II/lac/petsc_precondition.h
• /mnt/data/darndt/Sources/dealii-clang-6.0.0/source/lac/petsc_precondition.cc