Module io.jenetics.ext
Package io.jenetics.ext

Class SimulatedBinaryCrossover<G extends NumericGene<?,G>,C extends Comparable<? super C>>

java.lang.Object
io.jenetics.AbstractAlterer<G,C>
io.jenetics.Recombinator<G,C>
io.jenetics.Crossover<G,C>
io.jenetics.ext.SimulatedBinaryCrossover<G,C>
All Implemented Interfaces:
Alterer<G,C>
public class SimulatedBinaryCrossover<G extends NumericGene<?,G>,C extends Comparable<? super C>> extends Crossover<G,C>
Performs the simulated binary crossover (SBX) on a Chromosome of NumericGenes such that each position is either crossed contracted or expanded with a certain probability. The probability distribution is designed such that the children will lie closer to their parents as is the case with the single point binary crossover.

It is implemented as described in Deb, K. and Agrawal, R. B. 1995. Simulated binary crossover for continuous search space. Complex Systems, 9, pp. 115-148.

Since:
3.5
Version:
6.0

  • Constructor Details

    • SimulatedBinaryCrossover

      public SimulatedBinaryCrossover(double probability, double contiguity)
      Create a new simulated binary crossover alterer with the given parameters.
      Parameters:
      probability - the recombination probability
      contiguity - the contiguity value that specifies how close a child should be to its parents (larger value means closer). The value must be greater or equal than 0. Typical values are in the range [2..5].
      Throws:
      IllegalArgumentException - if the probability is not in the valid range of [0, 1]
      IllegalArgumentException - if contiguity is smaller than zero

    • SimulatedBinaryCrossover

      public SimulatedBinaryCrossover(double probability)
      Create a new simulated binary crossover alterer with the given parameters. The contiguity value is set to 2.5.
      Parameters:
      probability - the recombination probability
      Throws:
      IllegalArgumentException - if the probability is not in the valid range of [0, 1]
      IllegalArgumentException - if contiguity is smaller than zero

  • Method Details

    • contiguity

      public double contiguity()
      Return the contiguity value of the crossover.
      Returns:
      the contiguity value of the crossover

    • crossover

      protected int crossover(MSeq<G> that, MSeq<G> other)
      Description copied from class: Crossover
      Template method which performs the crossover. The arguments given are mutable non-null arrays of the same length.
      Specified by:
      crossover in class Crossover<G extends NumericGene<?,G>,C extends Comparable<? super C>>
      Parameters:
      that - the genes of the first chromosome
      other - the genes of the other chromosome
      Returns:
      the number of altered genes

    • toString

      public String toString()
      Overrides:
      toString in class Object