org.encog.ml.prg.opp
Class ConstMutation

java.lang.Object
  org.encog.ml.prg.opp.ConstMutation

All Implemented Interfaces:

EvolutionaryOperator

public class ConstMutation
extends Object
implements EvolutionaryOperator

Mutate the constant nodes of an Encog program. This mutation only changes values and does not alter the structure.

Constructor Summary

ConstMutation(EncogProgramContext theContext, double theFrequency, double theSigma)
Construct a const mutator.

Method Summary

void	init(EvolutionaryAlgorithm theOwner) Called to setup the evolutionary operator.
int	offspringProduced()
int	parentsNeeded()
void	performOperation(Random rnd, Genome[] parents, int parentIndex, Genome[] offspring, int offspringIndex) Perform the evolutionary operation.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstMutation

public ConstMutation(EncogProgramContext theContext,
                     double theFrequency,
                     double theSigma)

Construct a const mutator.

Parameters:

theContext - The program context.

theFrequency - The frequency of mutation.

theSigma - The sigma to use for mutation.

Method Detail

init

public void init(EvolutionaryAlgorithm theOwner)

Called to setup the evolutionary operator.

Specified by:

init in interface EvolutionaryOperator

Parameters:

theOwner - The evolutionary algorithm used with this operator.

offspringProduced

public int offspringProduced()

Specified by:

offspringProduced in interface EvolutionaryOperator

Returns:

The number of offspring produced by this type of crossover.

parentsNeeded

public int parentsNeeded()

Specified by:

parentsNeeded in interface EvolutionaryOperator

Returns:

The number of parents needed.

performOperation

public void performOperation(Random rnd,
                             Genome[] parents,
                             int parentIndex,
                             Genome[] offspring,
                             int offspringIndex)

Perform the evolutionary operation.

Specified by:

performOperation in interface EvolutionaryOperator

Parameters:

rnd - A random number generator.

parents - The parents.

parentIndex - The index into the parents array.

offspring - The offspring.

offspringIndex - An index into the offspring array.