cern.colt.matrix.tdouble.algo.solver.preconditioner
Class DoubleICC

java.lang.Object
  cern.colt.matrix.tdouble.algo.solver.preconditioner.DoubleICC

All Implemented Interfaces:

DoublePreconditioner

public class DoubleICC
extends Object
implements DoublePreconditioner

Incomplete Cholesky preconditioner without fill-in using a compressed row matrix as internal storage

Constructor Summary

DoubleICC(RCDoubleMatrix2D R)
Sets up the ICC preconditioner

Method Summary

DoubleMatrix1D	apply(DoubleMatrix1D b, DoubleMatrix1D x) Solves the approximate problem with the given right hand side.
void	setMatrix(DoubleMatrix2D A) Sets the operator matrix for the preconditioner.
DoubleMatrix1D	transApply(DoubleMatrix1D b, DoubleMatrix1D x) Solves the approximate transpose problem with the given right hand side.

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleICC

public DoubleICC(RCDoubleMatrix2D R)

Sets up the ICC preconditioner

Parameters:

R - Matrix to use internally. For best performance, its non-zero pattern must conform to that of the system matrix

Method Detail

apply

public DoubleMatrix1D apply(DoubleMatrix1D b,
                            DoubleMatrix1D x)

Description copied from interface: DoublePreconditioner

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

Specified by:

apply in interface DoublePreconditioner

Parameters:

b - Right hand side of problem

x - Result is stored here

Returns:

x

transApply

public DoubleMatrix1D transApply(DoubleMatrix1D b,
                                 DoubleMatrix1D x)

Description copied from interface: DoublePreconditioner

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

Specified by:

transApply in interface DoublePreconditioner

Parameters:

b - Right hand side of problem

x - Result is stored here

Returns:

x

setMatrix

public void setMatrix(DoubleMatrix2D A)

Description copied from interface: DoublePreconditioner

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 DoublePreconditioner

Parameters:

A - Matrix to setup the preconditioner for. Not modified