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java.lang.Objectorg.apache.commons.math3.genetics.NPointCrossover<T>
T - generic type of the AbstractListChromosomes for crossoverpublic class NPointCrossover<T>
N-point crossover policy. For each iteration 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 (2-point crossover):
-C- denotes a crossover point
-C- -C- -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 VV (*) VV
/----\ /--------\ /-----\ /----\ /--------\ /-----\
c1 = (1 0 | 1 0 1 0 | 0 1 1) X c2 = (0 1 | 1 0 0 1 | 0 1 1)
This policy works only on AbstractListChromosome, and therefore it
is parameterized by T. Moreover, the chromosomes must have same lengths.
| Constructor Summary | |
|---|---|
NPointCrossover(int crossoverPoints)
Creates a new NPointCrossover policy using the given number of points. |
|
| Method Summary | |
|---|---|
ChromosomePair |
crossover(Chromosome first,
Chromosome second)
Performs a N-point crossover. |
int |
getCrossoverPoints()
Returns the number of crossover points used by this CrossoverPolicy. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public NPointCrossover(int crossoverPoints)
throws NotStrictlyPositiveException
NPointCrossover policy using the given number of points.
Note: the number of crossover points must be < chromosome length - 1.
This condition can only be checked at runtime, as the chromosome length is not known in advance.
crossoverPoints - the number of crossover points
NotStrictlyPositiveException - if the number of crossoverPoints is not strictly positive| Method Detail |
|---|
public int getCrossoverPoints()
CrossoverPolicy.
public ChromosomePair crossover(Chromosome first,
Chromosome second)
throws DimensionMismatchException,
MathIllegalArgumentException
-C- denotes a crossover point
-C- -C- -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 VV (*) VV
/----\ /--------\ /-----\ /----\ /--------\ /-----\
c1 = (1 0 | 1 0 1 0 | 0 1 1) X c2 = (0 1 | 1 0 0 1 | 0 1 1)
crossover in interface CrossoverPolicyfirst - first parent (p1)second - second parent (p2)
MathIllegalArgumentException - iff one of the chromosomes is
not an instance of AbstractListChromosome
DimensionMismatchException - if the length of the two chromosomes is different
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