Package org.uma.jmetal.component.catalogue.pso.velocityupdate.impl

Class ConstrainedVelocityUpdate

java.lang.Object

org.uma.jmetal.component.catalogue.pso.velocityupdate.impl.ConstrainedVelocityUpdate

All Implemented Interfaces:

VelocityUpdate

public class ConstrainedVelocityUpdate
extends Object
implements VelocityUpdate

Method implementing a constrained velocity update. This scheme is used in, for example, SMPSO.

Author:

Antonio J. Nebro, Daniel Doblas

Field Summary

Fields

Modifier and Type	Field	Description
protected double	c1Max
protected double	c1Min
protected double	c2Max
protected double	c2Min
protected double[]	deltaMax
protected double[]	deltaMin
protected double	r1Max
protected double	r1Min
protected double	r2Max
protected double	r2Min
protected JMetalRandom	randomGenerator

Constructor Summary

Constructors

Constructor	Description
ConstrainedVelocityUpdate(double r1Min, double r1Max, double r2Min, double r2Max, double c1Min, double c1Max, double c2Min, double c2Max, DoubleProblem problem)	Constructor
ConstrainedVelocityUpdate(double c1Min, double c1Max, double c2Min, double c2Max, DoubleProblem problem)

Method Summary

Modifier and Type	Method	Description
protected double	constrictionCoefficient(double c1, double c2)	Generate the coefficient constriction value
double[][]	update(List<DoubleSolution> swarm, double[][] speed, DoubleSolution[] localBest, BoundedArchive<DoubleSolution> leaders, GlobalBestSelection globalBestSelection, InertiaWeightComputingStrategy inertiaWeightComputingStrategy)

Methods inherited from class java.lang.Object

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

Field Details

c1Max

protected double c1Max

c1Min

protected double c1Min

c2Max

protected double c2Max

c2Min

protected double c2Min

r1Max

protected double r1Max

r1Min

protected double r1Min

r2Max

protected double r2Max

r2Min

protected double r2Min

randomGenerator

protected JMetalRandom randomGenerator

deltaMax

protected double[] deltaMax

deltaMin

protected double[] deltaMin

Constructor Details

ConstrainedVelocityUpdate

public ConstrainedVelocityUpdate(double r1Min,
 double r1Max,
 double r2Min,
 double r2Max,
 double c1Min,
 double c1Max,
 double c2Min,
 double c2Max,
 DoubleProblem problem)

Constructor

Parameters:

r1Min - double min value of uniformly distributed random number. Usually number in range [0,1].

r1Max - double max value of uniformly distributed random number. Usually number in range [0,1].

r2Min - double min value of uniformly distributed random number. Usually number in range [0,1].

r2Max - double max value of uniformly distributed random number. Usually number in range [0,1].

c1Min - : Min value for c1.

c1Max - : Max value for c1.

c2Min - : Min value for c2.

c2Max - : Max value for c2.

ConstrainedVelocityUpdate

public ConstrainedVelocityUpdate(double c1Min,
 double c1Max,
 double c2Min,
 double c2Max,
 DoubleProblem problem)

Method Details

update

public double[][] update(List<DoubleSolution> swarm,
 double[][] speed,
 DoubleSolution[] localBest,
 BoundedArchive<DoubleSolution> leaders,
 GlobalBestSelection globalBestSelection,
 InertiaWeightComputingStrategy inertiaWeightComputingStrategy)

Specified by:

update in interface VelocityUpdate

constrictionCoefficient

protected double constrictionCoefficient(double c1,
 double c2)

Generate the coefficient constriction value

Parameters:

c1 - value for c1.

c2 - value for c2

Returns:

Coefficient constriction