cern.colt.matrix.tfloat.algo.solver.preconditioner
Class FloatILU

java.lang.Object
  cern.colt.matrix.tfloat.algo.solver.preconditioner.FloatILU

All Implemented Interfaces:

FloatPreconditioner

public class FloatILU
extends Object
implements FloatPreconditioner

ILU(0) preconditioner using a compressed row matrix as internal storage

Constructor Summary

FloatILU(RCFloatMatrix2D LU)
Sets up the ILU preconditioner

Method Summary

FloatMatrix1D	apply(FloatMatrix1D b, FloatMatrix1D x) Solves the approximate problem with the given right hand side.
void	setMatrix(FloatMatrix2D A) Sets the operator matrix for the preconditioner.
FloatMatrix1D	transApply(FloatMatrix1D b, FloatMatrix1D 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

FloatILU

public FloatILU(RCFloatMatrix2D LU)

Sets up the ILU preconditioner

Parameters:

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

Method Detail

apply

public FloatMatrix1D apply(FloatMatrix1D b,
                           FloatMatrix1D x)

Description copied from interface: FloatPreconditioner

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

Specified by:

apply in interface FloatPreconditioner

Parameters:

b - Right hand side of problem

x - Result is stored here

Returns:

x

transApply

public FloatMatrix1D transApply(FloatMatrix1D b,
                                FloatMatrix1D x)

Description copied from interface: FloatPreconditioner

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

Specified by:

transApply in interface FloatPreconditioner

Parameters:

b - Right hand side of problem

x - Result is stored here

Returns:

x

setMatrix

public void setMatrix(FloatMatrix2D A)

Description copied from interface: FloatPreconditioner

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 FloatPreconditioner

Parameters:

A - Matrix to setup the preconditioner for. Not modified