Package org.uma.jmetal.qualityindicator.impl

Class Spread

java.lang.Object

org.uma.jmetal.qualityindicator.QualityIndicator

org.uma.jmetal.qualityindicator.impl.Spread

public class Spread
extends QualityIndicator

This class implements the spread quality indicator. It must be only applied to two bi-objective problems. Reference: Deb, K., Pratap, A., Agarwal, S., Meyarivan, T.: A fast and elitist multiobjective genetic algorithm: NSGA-II. IEEE Trans. on Evol. Computation 6 (2002) 182-197

Author:

Antonio J. Nebro, Juan J. Durillo

Field Summary

Fields inherited from class org.uma.jmetal.qualityindicator.QualityIndicator

referenceFront

Constructor Summary

Constructors

Constructor	Description
Spread()	Default constructor
Spread(double[][] referenceFront)	Constructor

Method Summary

Modifier and Type	Method	Description
double	compute(double[][] front)	Evaluate() method
String	description()
boolean	isTheLowerTheIndicatorValueTheBetter()	Returns true if lower indicator values are preferred and false otherwise
String	name()
QualityIndicator	newInstance()
double	spread(double[][] front, double[][] referenceFront)	Calculates the Spread metric.

Methods inherited from class org.uma.jmetal.qualityindicator.QualityIndicator

referenceFront, referenceFront

Methods inherited from class java.lang.Object

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

Constructor Details

Spread

public Spread()

Default constructor

Spread

public Spread(double[][] referenceFront)

Constructor

Parameters:

referenceFront -

Throws:

FileNotFoundException

Method Details

newInstance

public QualityIndicator newInstance()

Specified by:

newInstance in class QualityIndicator

compute

public double compute(double[][] front)

Evaluate() method

Specified by:

compute in class QualityIndicator

Parameters:

front -

Returns:

spread

public double spread(double[][] front,
 double[][] referenceFront)

Calculates the Spread metric.

Parameters:

front - The front.

referenceFront - The true pareto front.

name

public String name()

Specified by:

name in class QualityIndicator

description

public String description()

Specified by:

description in class QualityIndicator

isTheLowerTheIndicatorValueTheBetter

public boolean isTheLowerTheIndicatorValueTheBetter()

Description copied from class: QualityIndicator

Returns true if lower indicator values are preferred and false otherwise

Specified by:

isTheLowerTheIndicatorValueTheBetter in class QualityIndicator