Examples of org.jenetics.util.IndexStream

org.jenetics.util.IndexStream
Interface which delivers a stream of (positive) indexes ( {@code int}s)s. The stream ends if {@link #next()} returns {@code -1}. Here some usage examples: [code] final IndexStream stream = ...; for (int index = stream.next(); index != -1; index = stream.next()) { System.out.println(index); } [/code] [code] final IndexStream stream = ...; int index = 0; while ((index = stream.next()) != -1) { System.out.println(index); } [/code] @author Franz Wilhelmstötter @since 1.0 @version 2.0 — $Date$

  }


  @Override
  protected int mutate(final MSeq<G> genes, final double p) {
    final Random random = RandomRegistry.getRandom();
    final IndexStream stream = IndexStream.Random(genes.length(), p);


    int alterations = 0;
    for (int i = stream.next(); i != -1; i = stream.next()) {
      genes.set(i, mutate(genes.get(i), random));


      ++alterations;
    }

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    assert(population != null) : "Not null is guaranteed from base class.";


    final double p = pow(_probability, 1.0/3.0);
    final AtomicInteger alterations = new AtomicInteger(0);


    final IndexStream stream = IndexStream.Random(population.size(), p);
    for (int i = stream.next(); i != -1; i = stream.next()) {
      final Phenotype<G, C> pt = population.get(i);


      final Genotype<G> gt = pt.getGenotype();
      final Genotype<G> mgt = mutate(gt, p, alterations);

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    final double p,
    final AtomicInteger alterations
  ) {
    Genotype<G> gt = genotype;


    final IndexStream stream = IndexStream.Random(genotype.length(), p);
    final int start = stream.next();


    if (start != -1) {
      final MSeq<Chromosome<G>> chromosomes = genotype.toSeq().copy();


      for (int i = start; i != -1; i = stream.next()) {
        final Chromosome<G> chromosome = chromosomes.get(i);
        final MSeq<G> genes = chromosome.toSeq().copy();


        final int mutations = mutate(genes, p);
        if (mutations > 0) {

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   * @param genes the genes to mutate.
   * @param p the gene mutation probability.
   * @return the number of performed mutations
   */
  protected int mutate(final MSeq<G> genes, final double p) {
    final IndexStream stream = IndexStream.Random(genes.length(), p);


    int alterations = 0;
    for (int i = stream.next(); i != -1; i = stream.next()) {
      genes.set(i, genes.get(i).newInstance());
      ++alterations;
    }


    return alterations;

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  public final <C extends Comparable<? super C>> int alter(
    final Population<G, C> population, final int generation
  ) {
    final Random random = RandomRegistry.getRandom();
    final int order = Math.min(_order, population.size());
    final IndexStream stream = IndexStream.Random(
      population.size(), _probability
    );


    int alterations = 0;
    for (int i = stream.next(); i != -1; i = stream.next()) {
      final int[] individuals = subset(population.size(), order, random);
      individuals[0] = i;


      alterations += recombine(population, individuals, generation);
    }

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  protected int mutate(final MSeq<G> genes, final double p) {
    int alterations = 0;


    if (genes.length() > 1) {
      final Random random = RandomRegistry.getRandom();
      final IndexStream stream = IndexStream.Random(
        genes.length(), p, random
      );


      for (int i = stream.next(); i != -1; i = stream.next()) {
        final int j = random.nextInt(genes.length());
        genes.swap(i, j);


        ++alterations;
      }

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Related Classes of org.jenetics.util.IndexStream

org.jenetics.GaussianMutator

org.jenetics.Mutator

org.jenetics.Recombinator

org.jenetics.SwapMutator

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