Class OnePointCrossover<T>

java.lang.Object
org.apache.commons.math.genetics.OnePointCrossover<T>
Type Parameters:
T - generic type of the AbstractListChromosomes for crossover
All Implemented Interfaces:
CrossoverPolicy

public class OnePointCrossover<T> extends Object implements CrossoverPolicy
One point crossover policy. A random crossover point is selected and the first part from each parent is copied to the corresponding child, and the second parts are copied crosswise. Example:
 -C- denotes a crossover point
                   -C-                                -C-
 p1 = (1 0 1 0 0 1  | 0 1 1)    X    p2 = (0 1 1 0 1 0  | 1 1 1)
         \------------/ \-----/              \------------/ \-----/
            ||         (*)                       ||        (**)
            VV         (**)                      VV        (*)
      /------------\ /-----\              /------------\ /-----\
 c1 = (1 0 1 0 0 1  | 1 1 1)    X    p2 = (0 1 1 0 1 0  | 0 1 1)
 
This policy works only on AbstractListChromosome, and therefore it is parametrized by T. Moreover, the chromosomes must have same lengths.
Since:
2.0
Version:
$Revision: 903046 $ $Date: 2010-01-26 03:07:26 +0100 (mar. 26 janv. 2010) $
  • Constructor Details

    • OnePointCrossover

      public OnePointCrossover()
  • Method Details

    • crossover

      public ChromosomePair crossover(Chromosome first, Chromosome second)
      Performs one point crossover. A random crossover point is selected and the first part from each parent is copied to the corresponding child, and the second parts are copied crosswise. Example: -C- denotes a crossover point -C- -C- p1 = (1 0 1 0 0 1 | 0 1 1) X p2 = (0 1 1 0 1 0 | 1 1 1) \------------/ \-----/ \------------/ \-----/ || (*) || (**) VV (**) VV (*) /------------\ /-----\ /------------\ /-----\ c1 = (1 0 1 0 0 1 | 1 1 1) X p2 = (0 1 1 0 1 0 | 0 1 1)
      Specified by:
      crossover in interface CrossoverPolicy
      Parameters:
      first - first parent (p1)
      second - second parent (p2)
      Returns:
      pair of two children (c1,c2)