org.moeaframework.core.operator.permutation
Class Swap

java.lang.Object
  org.moeaframework.core.operator.permutation.Swap

All Implemented Interfaces:

Variation

public class Swap
extends Object
implements Variation

Swap mutation operator. Randomly selects two entries in the permutation and swaps their position.

This operator is type-safe.

Constructor Summary

Swap(double probability)
Constructs a swap mutation operator with the specified probability of mutating a variable.

Method Summary

static void	evolve(Permutation permutation) Evolves the specified permutation using the swap mutation operator.
Solution[]	evolve(Solution[] parents) Evolves one or more parent solutions (specified by getArity) and produces one or more child solutions.
int	getArity() Returns the number of solutions that must be supplied to the evolve method.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Swap

public Swap(double probability)

Constructs a swap mutation operator with the specified probability of mutating a variable.

Parameters:

probability - the probability of mutating a variable

Method Detail

evolve

public Solution[] evolve(Solution[] parents)

Description copied from interface: Variation

Evolves one or more parent solutions (specified by getArity) and produces one or more child solutions. By contract, the parents must not be modified. The copy constructor should be used to create copies of the parents with these copies subsequently modified.

Specified by:

evolve in interface Variation

Parameters:

parents - the array of parent solutions

Returns:

an array of child solutions

evolve

public static void evolve(Permutation permutation)

Evolves the specified permutation using the swap mutation operator.

Parameters:

permutation - the permutation to be mutated

getArity

public int getArity()

Description copied from interface: Variation

Returns the number of solutions that must be supplied to the evolve method.

Specified by:

getArity in interface Variation

Returns:

the number of solutions that must be supplied to the evolve method