no.uib.cipr.matrix.distributed
Class BlockDiagonalPreconditioner

java.lang.Object
  no.uib.cipr.matrix.distributed.BlockDiagonalPreconditioner

All Implemented Interfaces:

Preconditioner

Direct Known Subclasses:

TwoLevelPreconditioner

public class BlockDiagonalPreconditioner
extends java.lang.Object
implements Preconditioner

Block diagonal preconditioner

Constructor Summary

BlockDiagonalPreconditioner(Preconditioner prec)
Constructor for BlockDiagonalPreconditioner

Method Summary

Vector	apply(Vector b, Vector x) Solves the approximate problem with the given right hand side.
void	setMatrix(Matrix A) Sets the operator matrix for the preconditioner.
Vector	transApply(Vector b, Vector x) Solves the approximate transpose problem with the given right hand side.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BlockDiagonalPreconditioner

public BlockDiagonalPreconditioner(Preconditioner prec)

Constructor for BlockDiagonalPreconditioner

Parameters:

prec - Preconditioner to apply on the blocks. As this preconditioner is meant to be used for distributed memory matrices, the preconditioner should be constructed on A.getBlock()

Method Detail

apply

public Vector apply(Vector b,
                    Vector x)

Description copied from interface: Preconditioner

Solves the approximate problem with the given right hand side. Result is stored in given solution vector

Specified by:

apply in interface Preconditioner

Parameters:

b - Right hand side of problem

x - Result is stored here

Returns:

x

transApply

public Vector transApply(Vector b,
                         Vector x)

Description copied from interface: Preconditioner

Solves the approximate transpose problem with the given right hand side. Result is stored in given solution vector

Specified by:

transApply in interface Preconditioner

Parameters:

b - Right hand side of problem

x - Result is stored here

Returns:

x

setMatrix

public void setMatrix(Matrix A)

Description copied from interface: Preconditioner

Sets the operator matrix for the preconditioner. This method must be called before a preconditioner is used by an iterative solver

Specified by:

setMatrix in interface Preconditioner

Parameters:

A - Matrix to setup the preconditioner for. Not modified