no.uib.cipr.matrix.sparse
Class DiagonalPreconditioner

java.lang.Object
  extended by no.uib.cipr.matrix.sparse.DiagonalPreconditioner
All Implemented Interfaces:
Preconditioner

public class DiagonalPreconditioner
extends java.lang.Object
implements Preconditioner

Diagonal preconditioner. Uses the inverse of the diagonal as preconditioner


Constructor Summary
DiagonalPreconditioner(int n)
          Constructor for DiagonalPreconditioner
 
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

DiagonalPreconditioner

public DiagonalPreconditioner(int n)
Constructor for DiagonalPreconditioner

Parameters:
n - Problem size (number of rows)
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