Package GradientMethods

Class ConjugateGradientMethod

java.lang.Object

GradientMethods.AbstractGradientMethod

GradientMethods.ConjugateGradientMethod

All Implemented Interfaces:

Method

public class ConjugateGradientMethod
extends AbstractGradientMethod

Class of ConjugateGradient realisation

Field Summary

Fields inherited from class GradientMethods.AbstractGradientMethod

epsilon, log, out

Constructor Summary

Constructors

Constructor	Description
ConjugateGradientMethod(double epsilon)	Standard constructor
ConjugateGradientMethod(double epsilon, boolean log, java.lang.String fileName)	Full constructor

Method Summary

Modifier and Type	Method	Description
double[]	findMinimum(Function function, double[] x0)	search minimum of the function with start from the point in x_0
private double	scalar(double[] a, double[] b)
private double[]	startIteration(Function function, double[] prevX)	Iterative method of ConjugateGradient.

Methods inherited from class GradientMethods.AbstractGradientMethod

log

Methods inherited from class java.lang.Object

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

Constructor Details

ConjugateGradientMethod

public ConjugateGradientMethod(double epsilon)

Standard constructor

Parameters:

epsilon - AbstractGradientMethod.epsilon

See Also:

AbstractGradientMethod(double)

ConjugateGradientMethod

public ConjugateGradientMethod(double epsilon, boolean log, java.lang.String fileName) throws java.io.FileNotFoundException

Full constructor

Parameters:

epsilon - AbstractGradientMethod.epsilon

log - AbstractGradientMethod.log

fileName - output file for AbstractGradientMethod.out

Throws:

java.io.FileNotFoundException - if specified output file was not found

See Also:

AbstractGradientMethod(double, boolean, String)

Method Details

findMinimum

public double[] findMinimum(Function function, double[] x0) throws java.io.IOException

Description copied from interface: Method

search minimum of the function with start from the point in x_0

Parameters:

function - explores function

x0 - point for the start of exploring

Returns:

minimum of the function

Throws:

java.io.IOException - exception when log from function computing throw exception

startIteration

private double[] startIteration(Function function, double[] prevX) throws java.io.IOException

Iterative method of ConjugateGradient.

Parameters:

function - explored fucntion

prevX - point of start for current iterative launch

Returns:

temporary result of minimum

Throws:

java.io.IOException - exception from AbstractGradientMethod.log(double[], double[])

scalar

private double scalar(double[] a, double[] b)