org.uma.jmetal.qualityindicator.impl

Class Spread<S extends Solution<?>>

java.lang.Object

org.uma.jmetal.util.naming.impl.SimpleDescribedEntity

org.uma.jmetal.qualityindicator.impl.GenericIndicator<S>

org.uma.jmetal.qualityindicator.impl.Spread<S>

All Implemented Interfaces:

Serializable, QualityIndicator<List<S>,Double>, DescribedEntity

public class Spread<S extends Solution<?>>
extends GenericIndicator<S>

This class implements the spread quality indicator. It must be only to two bi-objective problem. 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

See Also:

Serialized Form

Field Summary

Fields inherited from class org.uma.jmetal.qualityindicator.impl.GenericIndicator

referenceParetoFront

Constructor Summary

Constructors

Constructor and Description
Spread() Default constructor
Spread(Front referenceParetoFront) Constructor
Spread(String referenceParetoFrontFile) Constructor

Method Summary

Modifier and Type	Method and Description
Double	evaluate(List<S> solutionList) Evaluate() method
String	getDescription()
String	getName()
boolean	isTheLowerTheIndicatorValueTheBetter() This method returns true if lower indicator values are preferred and false otherwise
double	spread(Front front, Front referenceFront) Calculates the Spread metric.

Methods inherited from class org.uma.jmetal.qualityindicator.impl.GenericIndicator

setReferenceParetoFront, setReferenceParetoFront

Methods inherited from class org.uma.jmetal.util.naming.impl.SimpleDescribedEntity

setDescription, setName, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Spread

public Spread()

Default constructor

Spread

public Spread(String referenceParetoFrontFile)
       throws FileNotFoundException

Constructor

Parameters:

referenceParetoFrontFile -

Throws:

FileNotFoundException

Spread

public Spread(Front referenceParetoFront)

Constructor

Parameters:

referenceParetoFront -

Throws:

FileNotFoundException

Method Detail

evaluate

public Double evaluate(List<S> solutionList)

Evaluate() method

Parameters:

solutionList -

Returns:

spread

public double spread(Front front,
                     Front referenceFront)

Calculates the Spread metric.

Parameters:

front - The front.

referenceFront - The true pareto front.

getName

public String getName()

Specified by:

getName in interface DescribedEntity

Overrides:

getName in class SimpleDescribedEntity

Returns:

the name of the DescribedEntity

getDescription

public String getDescription()

Specified by:

getDescription in interface DescribedEntity

Overrides:

getDescription in class SimpleDescribedEntity

Returns:

the description of the DescribedEntity

isTheLowerTheIndicatorValueTheBetter

public boolean isTheLowerTheIndicatorValueTheBetter()

Description copied from class: GenericIndicator

This method returns true if lower indicator values are preferred and false otherwise

Specified by:

isTheLowerTheIndicatorValueTheBetter in class GenericIndicator<S extends Solution<?>>

Returns: