no.uib.cipr.matrix.distributed
Class BlockDiagonalPreconditioner

java.lang.Object
  extended by 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