net.sourceforge.jabm.evolution
Class FitnessProportionateBreeder

java.lang.Object
  net.sourceforge.jabm.evolution.FitnessProportionateBreeder

All Implemented Interfaces:

Breeder

public class FitnessProportionateBreeder
extends java.lang.Object
implements Breeder

A breeder which implements Fitness-proportionate reproduction. Agents are selected for inclusion in the next generation with a probability proportionate to their fitness, as defined by an exogenous fitness function. When agents reproduce they do so via an ImitationOperator which specifies how agents are copied from one generation to the next.

Field Summary

protected FitnessFunction	fitnessFunction The fitness function which specifies the fitness of each agent.
protected ImitationOperator	imitationFunction
protected double	imitationProbability
protected cern.jet.random.engine.RandomEngine	prng
protected double	totalFitness

Constructor Summary

FitnessProportionateBreeder()

Method Summary

int	choose(double[] cummulativeFitnesses)
double[]	cummulativeFitnesses(AgentList agents)
double	getFitness(Agent i)
FitnessFunction	getFitnessFunction()
ImitationOperator	getImitationOperator()
double	getImitationProbability()
cern.jet.random.engine.RandomEngine	getPrng()
void	reproduce(Agent child, Agent parent)
AgentList	reproduce(AgentList currentGeneration) Compute the next generation of agents.
void	setFitnessFunction(FitnessFunction fitnessFunction)
void	setImitationOperator(ImitationOperator imitationFunction)
void	setImitationProbability(double imitationProbability)
void	setPrng(cern.jet.random.engine.RandomEngine prng)

Methods inherited from class java.lang.Object

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

Field Detail

fitnessFunction

protected FitnessFunction fitnessFunction

The fitness function which specifies the fitness of each agent.

imitationFunction

protected ImitationOperator imitationFunction

prng

protected cern.jet.random.engine.RandomEngine prng

totalFitness

protected double totalFitness

imitationProbability

protected double imitationProbability

Constructor Detail

FitnessProportionateBreeder

public FitnessProportionateBreeder()

Method Detail

reproduce

public AgentList reproduce(AgentList currentGeneration)

Description copied from interface: Breeder

Compute the next generation of agents.

Specified by:

reproduce in interface Breeder

Parameters:

currentGeneration - The agents comprising the current generation.

Returns:

An AgentList representing the next generation after reproduction has occurred.

choose

public int choose(double[] cummulativeFitnesses)

reproduce

public void reproduce(Agent child,
                      Agent parent)

cummulativeFitnesses

public double[] cummulativeFitnesses(AgentList agents)

getFitness

public double getFitness(Agent i)

getFitnessFunction

public FitnessFunction getFitnessFunction()

setFitnessFunction

public void setFitnessFunction(FitnessFunction fitnessFunction)

getPrng

public cern.jet.random.engine.RandomEngine getPrng()

setPrng

public void setPrng(cern.jet.random.engine.RandomEngine prng)

getImitationOperator

public ImitationOperator getImitationOperator()

setImitationOperator

public void setImitationOperator(ImitationOperator imitationFunction)

getImitationProbability

public double getImitationProbability()

setImitationProbability

public void setImitationProbability(double imitationProbability)