lio.search.pso.contchain
Class StdContParticle

java.lang.Object
  lio.search.pso.Particle
      lio.search.pso.contchain.StdContParticle

public class StdContParticle
extends Particle

Implements the particle used in PSO algorithms. Notice that it combines both inertial and Clerc's constraint for velocity updating.

Field Summary

(package private) static double	cognitive Cognitive component of velocity updating.
(package private) static double	constraint Constraint for velocity updating
(package private) static double	inertia Inertia
(package private) static double[][]	ranges Ranges for each variable.
(package private) static int	size
(package private) static double	social Social component of velocity updating.
(package private) static double	vmax Factor for max velocity according to range.

Fields inherited from class lio.search.pso.Particle

bestNeighbour, bestPosition, currentPosition

Constructor Summary

StdContParticle(ContChain pCurrentPos)
Constructor

Method Summary

static void	calculateConstraint() Calculates the constraint in case the parameter is equal to 0 by using clerc's formula.
static void	calculateMaxVelocities() Calculates the maxVelocity for each component of the particle as a proportion of the range.
void	newPoint() Calculates the new point Notice that both constraint(k) and inertia are used.
static void	setRanges(double[][] pRanges)

Methods inherited from class lio.search.pso.Particle

bestValue, getBestNeighbour, getBestPosition, getCurrentPosition, move, setBestNeighbour, setBestPosition, setCurrentPosition, value

Methods inherited from class java.lang.Object

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

Field Detail

size

static int size

inertia

static double inertia

Inertia

cognitive

static double cognitive

Cognitive component of velocity updating.

social

static double social

Social component of velocity updating.

constraint

static double constraint

Constraint for velocity updating

vmax

static double vmax

Factor for max velocity according to range. It is the same for each variable.

ranges

static double[][] ranges

Ranges for each variable. Necessary to keep particles in the right domain.

Constructor Detail

StdContParticle

public StdContParticle(ContChain pCurrentPos)

Constructor

Method Detail

setRanges

public static void setRanges(double[][] pRanges)

Parameters:

ranges - the ranges to set

calculateConstraint

public static void calculateConstraint()

Calculates the constraint in case the parameter is equal to 0 by using clerc's formula.

calculateMaxVelocities

public static void calculateMaxVelocities()

Calculates the maxVelocity for each component of the particle as a proportion of the range.

newPoint

public void newPoint()

Calculates the new point Notice that both constraint(k) and inertia are used. They can be fixed so as to use only one of them. If the constraint=1, it has no effect. If the constraint=0, k is calculated with Clerc's formula.

Specified by:

newPoint in class Particle