Package org.jenetics.util

Examples of org.jenetics.util.LCG64ShiftRandom$ThreadSafe

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public class Knapsack {

  private static KnapsackFunction FF(final int n, final double size) {
    final Item[] items = new Item[n];
    try (Scoped<? extends Random> random =
      RandomRegistry.scope(new LCG64ShiftRandom(123)))
    {
      for (int i = 0; i < items.length; ++i) {
        items[i] = new Item(
          nextDouble(random.get(), 0, 100),
          nextDouble(random.get(), 0, 100)
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    }
  }

  @Test(invocationCount = 5)
  public void toBigInteger() {
    final LCG64ShiftRandom random = new LCG64ShiftRandom();
    final BigInteger value = new BigInteger(1056, random);
    final BitChromosome chromosome = BitChromosome.of(value);

    assertEquals(chromosome.toBigInteger(), value);
  }
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    }
  }

  @Test(dataProvider = "quantiles")
  public void quantile(final Double q) {
    final Random random = new LCG64ShiftRandom(1234);
    final Quantile<Double> quantile = new Quantile<>(q);

    final int N = 2_000_000;
    for (int i = 0; i < N; ++i) {
      quantile.accumulate(random.nextDouble());
    }

    Assert.assertEquals(quantile.getSamples(), N);
    Assert.assertEquals(quantile.getValue(), q, 1.0/sqrt(N));
  }
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    return SelectorFactories.RouletteWheelSelector;
  }

  @Test
  public void minimize() {
    try (Scoped<? extends Random> sr = RandomRegistry.scope(new LCG64ShiftRandom(7345))) {
      final Function<Genotype<IntegerGene>, Integer> ff =
        new Function<Genotype<IntegerGene>, Integer>() {
          @Override
          public Integer apply(final Genotype<IntegerGene> g) {
            return g.getChromosome().getGene().getAllele();
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    }
  }

  @Test
  public void maximize() {
    try (Scoped<? extends Random> sr = RandomRegistry.scope(new LCG64ShiftRandom(7345))) {
      final Function<Genotype<IntegerGene>, Integer> ff =
        new Function<Genotype<IntegerGene>, Integer>() {
          @Override
          public Integer apply(final Genotype<IntegerGene> g) {
            return g.getChromosome().getGene().getAllele();
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    final int loops = Integer.MAX_VALUE;//1_000_000_000;

    test(new Random(), loops);
    test(ThreadLocalRandom.current(), loops);
    //test(new XORShiftRandom(), loops);
    test(new LCG64ShiftRandom(), loops);
  }
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public class Knapsack {

  private static KnapsackFunction FF(final int n, final double size) {
    final Item[] items = new Item[n];
    try (Scoped<? extends Random> random =
      RandomRegistry.scope(new LCG64ShiftRandom(123)))
    {
      for (int i = 0; i < items.length; ++i) {
        items[i] = new Item(
          nextDouble(random.get(), 0, 100),
          nextDouble(random.get(), 0, 100)
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Related Classes of org.jenetics.util.LCG64ShiftRandom$ThreadSafe

  • Knapsack
  • org.jenetics.BitChromosomeTest
  • org.jenetics.example.Knapsack
  • org.jenetics.RouletteWheelSelectorTest
  • org.jenetics.stat.QuantileTest
  • org.jenetics.util.performance.RandomPerformanceTests
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