Operator.Operations
Class RouletteWheel

java.lang.Object
  Operator.Operations.SelectionOperation
      Operator.Operations.RouletteWheel

All Implemented Interfaces:

Operation, ParameterI, Stochastic

Direct Known Subclasses:

ProportionalRouletteWheel, ScaledRouletteWheel

public abstract class RouletteWheel
extends SelectionOperation
implements Stochastic

This is an abstract class for creating Roulette wheel selection methods with different distributions

Author:

jbyrne

Field Summary

protected double[]	accProbs
protected double	minFit
protected RandomNumberGenerator	rng
protected boolean	smallFit
protected double	sumFit

Fields inherited from class Operator.Operations.SelectionOperation

selectedPopulation, size

Constructor Summary

RouletteWheel()
New instance

RouletteWheel(int size, RandomNumberGenerator rng)

Method Summary

protected abstract void	calculateAccumulatedFitnessProbabilities(java.util.List<Individual> operands)
protected void	calculateFitnessSum(java.util.List<Individual> c) Calculate the fitness sum.
void	doOperation(Individual operand) Performs the operation on an operand
void	doOperation(java.util.List<Individual> operands) Performs the operation on the list passed
RandomNumberGenerator	getRNG() Get the number generator
void	rankPopulation(java.util.List<Individual> operands) Rank the population
void	setProperties(java.util.Properties p) Set properties
void	setRNG(RandomNumberGenerator m) Set the number generator
protected void	spinRoulette(java.util.List<Individual> operands) Selects Indivudals from operand and adds to the selected population until the selected population is full.

Methods inherited from class Operator.Operations.SelectionOperation

getSelectedPopulation, getSize

Methods inherited from class java.lang.Object

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

Field Detail

rng

protected RandomNumberGenerator rng

minFit

protected double minFit

sumFit

protected double sumFit

smallFit

protected boolean smallFit

accProbs

protected double[] accProbs

Constructor Detail

RouletteWheel

public RouletteWheel(int size,
                     RandomNumberGenerator rng)

RouletteWheel

public RouletteWheel()

New instance

Method Detail

setProperties

public void setProperties(java.util.Properties p)

Description copied from class: SelectionOperation

Set properties

Specified by:

setProperties in interface ParameterI

Overrides:

setProperties in class SelectionOperation

Parameters:

p - object containing properties

doOperation

public void doOperation(Individual operand)

Description copied from interface: Operation

Performs the operation on an operand

Specified by:

doOperation in interface Operation

Specified by:

doOperation in class SelectionOperation

Parameters:

operand - operand to perform operation on

doOperation

public void doOperation(java.util.List<Individual> operands)

Description copied from interface: Operation

Performs the operation on the list passed

Specified by:

doOperation in interface Operation

Specified by:

doOperation in class SelectionOperation

Parameters:

operands - operands to be operated on

rankPopulation

public void rankPopulation(java.util.List<Individual> operands)

Rank the population

Parameters:

operands - population

spinRoulette

protected void spinRoulette(java.util.List<Individual> operands)

Selects Indivudals from operand and adds to the selected population until the selected population is full.

Parameters:

operands - Individuals to be chosen form

calculateAccumulatedFitnessProbabilities

protected abstract void calculateAccumulatedFitnessProbabilities(java.util.List<Individual> operands)

calculateFitnessSum

protected void calculateFitnessSum(java.util.List<Individual> c)

Calculate the fitness sum. Get the minimum fitness. If fitness is NaN or Infinite Double.MAX_VAALUE is assigned

Parameters:

c - List of individuals which fitness is taken into account

getRNG

public RandomNumberGenerator getRNG()

Description copied from interface: Stochastic

Get the number generator

Specified by:

getRNG in interface Stochastic

Returns:

number generator

setRNG

public void setRNG(RandomNumberGenerator m)

Description copied from interface: Stochastic

Set the number generator

Specified by:

setRNG in interface Stochastic

Parameters:

m - number generator