examples
Class MinimizingFitnessFunctionCached

java.lang.Object
  org.jgap.FitnessFunction
      org.jgap.CachedFitnessFunction
          examples.MinimizingFitnessFunctionCached

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, ICloneable

public class MinimizingFitnessFunctionCached
extends CachedFitnessFunction

For any Javadoc see MinimizingMakeChangeFitnessFunction.

Additionally, this fitness function is cached.

Since:

3.2

See Also:

Serialized Form

Field Summary

static int

MAX_BOUND

Fields inherited from class org.jgap.FitnessFunction

DELTA, NO_FITNESS_VALUE

Constructor Summary

MinimizingFitnessFunctionCached(int a_targetAmount)

Method Summary

static int	amountOfChange(IChromosome a_potentialSolution)
protected double	changeDifferenceBonus(double a_maxFitness, int a_changeDifference)
protected double	computeCoinNumberPenalty(double a_maxFitness, int a_coins)
double	evaluate(IChromosome a_subject) Determine the fitness of the given Chromosome instance.
static int	getNumberOfCoinsAtGene(IChromosome a_potentialSolution, int a_position)
static int	getTotalNumberOfCoins(IChromosome a_potentialsolution) Returns the total number of coins represented by all of the genes in the given potential solution.

Methods inherited from class org.jgap.CachedFitnessFunction

getBusinessKey, getFitnessValue

Methods inherited from class org.jgap.FitnessFunction

clone, getLastComputedFitnessValue

Methods inherited from class java.lang.Object

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

Field Detail

MAX_BOUND

public static final int MAX_BOUND

See Also:

Constant Field Values

Constructor Detail

MinimizingFitnessFunctionCached

public MinimizingFitnessFunctionCached(int a_targetAmount)

Method Detail

evaluate

public double evaluate(IChromosome a_subject)

Description copied from class: FitnessFunction

Determine the fitness of the given Chromosome instance. The higher the return value, the more fit the instance. This method should always return the same fitness value for two equivalent Chromosome instances.

Specified by:

evaluate in class FitnessFunction

Parameters:

a_subject - the Chromosome instance to evaluate

Returns:

positive double reflecting the fitness rating of the given Chromosome. Note that if a non-positive double is returned, a RuntimeException should be generated

changeDifferenceBonus

protected double changeDifferenceBonus(double a_maxFitness,
                                       int a_changeDifference)

computeCoinNumberPenalty

protected double computeCoinNumberPenalty(double a_maxFitness,
                                          int a_coins)

amountOfChange

public static int amountOfChange(IChromosome a_potentialSolution)

getNumberOfCoinsAtGene

public static int getNumberOfCoinsAtGene(IChromosome a_potentialSolution,
                                         int a_position)

getTotalNumberOfCoins

public static int getTotalNumberOfCoins(IChromosome a_potentialsolution)

Returns the total number of coins represented by all of the genes in the given potential solution.

Parameters:

a_potentialsolution - the potential solution to evaluate

Returns:

total number of coins represented by the given Chromosome

Since:

1.0