Operator.Operations
Class ProportionalRouletteWheel

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

All Implemented Interfaces:

Operation, ParameterI, Stochastic

public class ProportionalRouletteWheel
extends RouletteWheel
implements Stochastic

Roulette wheel selection based on fitness proprtional selection. it uses assigns probabilities as 1/(1-fitness) where the smaller the value the more likely it is to be selected

Field Summary

Fields inherited from class Operator.Operations.RouletteWheel

accProbs, minFit, rng, smallFit, sumFit

Fields inherited from class Operator.Operations.SelectionOperation

selectedPopulation, size

Constructor Summary

ProportionalRouletteWheel()
New instance

ProportionalRouletteWheel(int size, RandomNumberGenerator rng)
New instance

Method Summary

protected void	calculateAccumulatedFitnessProbabilities(java.util.List<Individual> operands) Min fitness is the best fitness.
static void	main(java.lang.String[] args)

Methods inherited from class Operator.Operations.RouletteWheel

calculateFitnessSum, doOperation, doOperation, getRNG, rankPopulation, setProperties, setRNG, spinRoulette

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

Methods inherited from interface Util.Random.Stochastic

getRNG, setRNG

Constructor Detail

ProportionalRouletteWheel

public ProportionalRouletteWheel(int size,
                                 RandomNumberGenerator rng)

New instance

Parameters:

size - size of selection

rng - random number generator

ProportionalRouletteWheel

public ProportionalRouletteWheel()

New instance

Method Detail

calculateAccumulatedFitnessProbabilities

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

Min fitness is the best fitness. Subtracts the fitness from the fitness sum and divides by the fitness sum Store the accumulated probabilities in the accProbs array

Specified by:

calculateAccumulatedFitnessProbabilities in class RouletteWheel

Parameters:

operands - Individuals to take into account

main

public static void main(java.lang.String[] args)