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java.lang.Objectorg.apache.commons.math3.genetics.UniformCrossover<T>
T - generic type of the AbstractListChromosomes for crossoverpublic class UniformCrossover<T>
Perform Uniform Crossover [UX] on the specified chromosomes. A fixed mixing ratio is used to combine genes from the first and second parents, e.g. using a ratio of 0.5 would result in approximately 50% of genes coming from each parent. This is typically a poor method of crossover, but empirical evidence suggests that it is more exploratory and results in a larger part of the problem space being searched.
This crossover policy evaluates each gene of the parent chromosomes by chosing a
uniform random number p in the range [0, 1]. If p < ratio,
the parent genes are swapped. This means with a ratio of 0.7, 30% of the genes from the
first parent and 70% from the second parent will be selected for the first offspring (and
vice versa for the second offspring).
This policy works only on AbstractListChromosome, and therefore it
is parameterized by T. Moreover, the chromosomes must have same lengths.
| Constructor Summary | |
|---|---|
UniformCrossover(double ratio)
Creates a new UniformCrossover policy using the given mixing ratio. |
|
| Method Summary | |
|---|---|
ChromosomePair |
crossover(Chromosome first,
Chromosome second)
Perform a crossover operation on the given chromosomes. |
double |
getRatio()
Returns the mixing ratio 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 UniformCrossover(double ratio)
throws OutOfRangeException
UniformCrossover policy using the given mixing ratio.
ratio - the mixing ratio
OutOfRangeException - if the mixing ratio is outside the [0, 1] range| Method Detail |
|---|
public double getRatio()
CrossoverPolicy.
public ChromosomePair crossover(Chromosome first,
Chromosome second)
throws DimensionMismatchException,
MathIllegalArgumentException
crossover in interface CrossoverPolicyfirst - the first chromosome.second - the second chromosome.
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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