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

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

All Implemented Interfaces:

FloatPreconditioner

public class FloatDiagonal
extends Object
implements FloatPreconditioner

Diagonal preconditioner. Uses the inverse of the diagonal as preconditioner

Constructor Summary

FloatDiagonal(int n)
Constructor for DiagonalPreconditioner

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

FloatDiagonal

public FloatDiagonal(int n)

Constructor for DiagonalPreconditioner

Parameters:

n - Problem size (number of rows)

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