/*
* This file is part of JGAP.
*
* JGAP offers a dual license model containing the LGPL as well as the MPL.
*
* For licensing information please see the file license.txt included with JGAP
* or have a look at the top of class org.jgap.Chromosome which representatively
* includes the JGAP license policy applicable for any file delivered with JGAP.
*/
package examples.distinctGenes;
import org.jgap.*;
import org.jgap.impl.*;
/**
* Fitness function for our example. It's without sense, it's just to
* demonstrate how to evaluate a chromosome with 40 4-field-genes and one
* 3-field gene. Each toplevel-gene is a CompositeGene, each "field" within
* a CompositeGene is a BooleanGene here (arbitrarily chosen).
*
* @author Klaus Meffert
* @since 3.0
*/
public class SampleFitnessFunction
extends FitnessFunction {
/** String containing the CVS revision. Read out via reflection!*/
private final static String CVS_REVISION = "$Revision: 1.3 $";
/**
* Calculate the fitness value of a Chromosome.
* @param a_subject the Chromosome to be evaluated
* @return defect rate of our problem (the smaller the better)
*
* @author Klaus Meffert
* @since 3.0
*/
public double evaluate(IChromosome a_subject) {
int total = 0;
// Process the first 40 genes with 4 fields per gene
for (int i = 0; i < a_subject.size() - 1; i++) {
CompositeGene gene = (CompositeGene) a_subject.getGene(i);
for (int j = 0; j < 4; j++) {
// Now evaluate the fields within the gene somehow (here: just an
// example without sense).
// --------------------------------------------------------------
BooleanGene field = (BooleanGene) gene.geneAt(j);
if (field.booleanValue() == true) {
// A field with value true is seen as defect
total++;
}
}
}
// Process the last gene with 3 fields. Here, a field with value false
// is seen as defect (in opposition to the other genes)
CompositeGene gene = (CompositeGene) a_subject.getGene(a_subject.size() - 1);
for (int j = 0; j < 3; j++) {
BooleanGene field = (BooleanGene) gene.geneAt(j);
if (field.booleanValue() == false) {
// A field with value false is seen as defect
total++;
}
}
return total;
}
}