public function calcFitness(Individual $individual)
{
$correctGenes = 0;
for ($locus = 0; $locus < $individual->getChromosomeLength(); $locus++) {
if ($individual->getGene($locus) == 1) {
$correctGenes += 1;
}
}
$fitness = (double) $correctGenes / $individual->getChromosomeLength();
$individual->setFitness($fitness);
return $fitness;
}
public function mutateUniform(Population $population, Element $element)
{
$newPopulation = new Population($population->size());
for ($populationIndex = 0; $populationIndex < $population->size(); $populationIndex++) {
$individual = $population->getFittestIndividual($populationIndex);
$randomIndividual = new Individual($element);
for ($geneIndex = 0; $geneIndex < $individual->getChromosomeLength(); $geneIndex++) {
if ($populationIndex >= $this->elitismCount) {
if ($this->mutationRate > Random::generate()) {
$individual->setGene($geneIndex, $randomIndividual->getGene($geneIndex));
}
}
}
$newPopulation->setIndividual($populationIndex, $individual);
}
return $newPopulation;
}
