de.jstacs.algorithms.optimization

Class NegativeOneDimensionalFunction

java.lang.Object

de.jstacs.algorithms.optimization.OneDimensionalFunction

de.jstacs.algorithms.optimization.NegativeOneDimensionalFunction

All Implemented Interfaces:

Function

public class NegativeOneDimensionalFunction
extends OneDimensionalFunction

This class extends the class OneDimensionalFunction. That class is useful when you want to find a maximum of any one-dimensional function. Just use this class and find the minimum of your new function. This minimum has the same abscissa and just a negative ordinate.

Author:

Jens Keilwagen

Constructor Summary

Constructors

Constructor and Description
NegativeOneDimensionalFunction(OneDimensionalFunction f) Creates the OneDimensionalFunction f for which -f should be calculated.

Method Summary

Modifier and Type	Method and Description
double	evaluateFunction(double x) Evaluates the function at position x.
double	evaluateFunction(double[] x) Evaluates the function at a certain vector (in mathematical sense) x.

Methods inherited from class de.jstacs.algorithms.optimization.OneDimensionalFunction

findMin, getDimensionOfScope

Methods inherited from class java.lang.Object

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

Constructor Detail

NegativeOneDimensionalFunction

public NegativeOneDimensionalFunction(OneDimensionalFunction f)

Creates the OneDimensionalFunction f for which -f should be calculated.

Parameters:

f - the OneDimensionalFunction

Method Detail

evaluateFunction

public double evaluateFunction(double[] x)
                        throws DimensionException,
                               EvaluationException

Description copied from interface: Function

Evaluates the function at a certain vector (in mathematical sense) x.

Specified by:

evaluateFunction in interface Function

Overrides:

evaluateFunction in class OneDimensionalFunction

Parameters:

x - the current vector

Returns:

the evaluation of the function

Throws:

DimensionException - if dim(x) != n, with

EvaluationException - if there was something wrong during the evaluation of the function

evaluateFunction

public double evaluateFunction(double x)
                        throws EvaluationException

Description copied from class: OneDimensionalFunction

Evaluates the function at position x.

Specified by:

evaluateFunction in class OneDimensionalFunction

Parameters:

x - the current position

Returns:

f(x)

Throws:

EvaluationException - if there was a mistake during evaluation of the function