no.uib.cipr.matrix.distributed
Class TwoLevelPreconditioner

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

All Implemented Interfaces:

Preconditioner

public class TwoLevelPreconditioner
extends BlockDiagonalPreconditioner

Two level preconditioner. Uses a block preconditioner as a subdomain solver, and algebraically constructs a coarse grid correcion operator

Constructor Summary

TwoLevelPreconditioner(Preconditioner prec, DistColMatrix A, DistVector z)

TwoLevelPreconditioner(Preconditioner prec, DistRowMatrix A, DistVector z)

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

TwoLevelPreconditioner

public TwoLevelPreconditioner(Preconditioner prec,
                              DistRowMatrix A,
                              DistVector z)

TwoLevelPreconditioner

public TwoLevelPreconditioner(Preconditioner prec,
                              DistColMatrix A,
                              DistVector z)

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

Overrides:

apply in class BlockDiagonalPreconditioner

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

Overrides:

transApply in class BlockDiagonalPreconditioner

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

Overrides:

setMatrix in class BlockDiagonalPreconditioner

Parameters:

A - Matrix to setup the preconditioner for. Not modified