/**
* Applies crossover. It generates two children.
*
* @param parent1 is the first parent.
* @param parent2 is the second parent
* @param child1 is the first child
* @param child2 is the second child.
*/
public void makeCrossover(
Classifier parent1, Classifier parent2, Classifier child1, Classifier child2) {
int i = 0;
// cross1 is a number between [0.. clLength-1]
int cross1 = (int) (Config.rand() * (double) Config.clLength);
// cross2 is a number between [1..clLenght].
int cross2 = (int) (Config.rand() * (double) Config.clLength) + 1;
if (cross1 > cross2) {
int aux = cross2;
cross2 = cross1;
cross1 = aux;
// In the else-if condition is not necessary to check if (cross2<clLength)
// to increment the point, because cross1 [0..length-1]
} else if (cross1 == cross2) cross2++;
// All the intervals (real representation) or genes (ternary representation) that
// are not in the cross point are crossed.
if (!Config.ternaryRep) {
for (i = cross1 + 1; i < cross2 - 1; i++) {
child2.setAllele(i, parent1);
child1.setAllele(i, parent2);
}
// Now we have to cross the border allele
child1.crossAllele(cross1, parent1, parent2);
child1.crossAllele(cross2 - 1, parent2, parent1);
child2.crossAllele(cross1, parent2, parent1);
child2.crossAllele(cross2 - 1, parent1, parent2);
} else {
for (i = cross1; i < cross2 - 1; i++) {
child2.setAllele(i, parent1);
child1.setAllele(i, parent2);
}
}
} // end makeCrossover
