Package org.apache.commons.math3.genetics

Class CycleCrossover<T>

java.lang.Object
org.apache.commons.math3.genetics.CycleCrossover<T>
Type Parameters:
T - generic type of the AbstractListChromosomes for crossover
All Implemented Interfaces:
CrossoverPolicy
public class CycleCrossover<T> extends Object implements CrossoverPolicy
Cycle Crossover [CX] builds offspring from ordered chromosomes by identifying cycles between two parent chromosomes. To form the children, the cycles are copied from the respective parents.

To form a cycle the following procedure is applied:

  1. start with the first gene of parent 1
  2. look at the gene at the same position of parent 2
  3. go to the position with the same gene in parent 1
  4. add this gene index to the cycle
  5. repeat the steps 2-5 until we arrive at the starting gene of this cycle
The indices that form a cycle are then used to form the children in alternating order, i.e. in cycle 1, the genes of parent 1 are copied to child 1, while in cycle 2 the genes of parent 1 are copied to child 2, and so forth ...

Example (zero-start cycle): 
 p1 = (8 4 7 3 6 2 5 1 9 0)    X   c1 = (8 1 2 3 4 5 6 7 9 0)
 p2 = (0 1 2 3 4 5 6 7 8 9)    X   c2 = (0 4 7 3 6 2 5 1 8 9)

 cycle 1: 8 0 9
 cycle 2: 4 1 7 2 5 6
 cycle 3: 3
This policy works only on AbstractListChromosome, and therefore it is parameterized by T. Moreover, the chromosomes must have same lengths.
Since:
3.1
See Also: