examples.simpleBoolean
Class MaxFunction

java.lang.Object
  org.jgap.FitnessFunction
      examples.simpleBoolean.MaxFunction

All Implemented Interfaces:

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

public class MaxFunction
extends FitnessFunction

Fitness function for our example. See evaluate(...) method for details.

Since:

2.0

See Also:

Serialized Form

Field Summary

Fields inherited from class org.jgap.FitnessFunction

DELTA, NO_FITNESS_VALUE

Constructor Summary

MaxFunction()

Method Summary

double

evaluate(IChromosome a_subject) This example implementation calculates the fitness value of Chromosomes using BooleanAllele implementations.

Methods inherited from class org.jgap.FitnessFunction

clone, getFitnessValue, getLastComputedFitnessValue

Methods inherited from class java.lang.Object

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

Constructor Detail

MaxFunction

public MaxFunction()

Method Detail

evaluate

public double evaluate(IChromosome a_subject)

This example implementation calculates the fitness value of Chromosomes using BooleanAllele implementations. It simply returns a fitness value equal to the numeric binary value of the bits. In other words, it optimizes the numeric value of the genes interpreted as bits. It should be noted that, for clarity, this function literally returns the binary value of the Chromosome's genes interpreted as bits. However, it would be better to return the value raised to a fixed power to exaggerate the difference between the higher values. For example, the difference between 254 and 255 is only about .04%, which isn't much incentive for the selector to choose 255 over 254. However, if you square the values, you then get 64516 and 65025, which is a difference of 0.8% -- twice as much and, therefore, twice the incentive to select the higher value.

Specified by:

evaluate in class FitnessFunction

Parameters:

a_subject - the Chromosome to be evaluated

Returns:

defect rate of our problem

Since:

2.0