MOEA Framework 2.12
API Specification

org.moeaframework.core.operator.program
Class PointMutation

java.lang.Object
  extended by org.moeaframework.core.operator.program.PointMutation
All Implemented Interfaces:
Variation

public class PointMutation
extends Object
implements Variation

Mutates a program by randomly selecting nodes in the expression tree and replacing the node with a new, compatible, randomly-selected node.

This operator is type-safe.


Constructor Summary
PointMutation(double probability)
          Constructs a new point mutation instance.
 
Method Summary
 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.
protected  void mutate(Node node, Rules rules)
          Applies point mutation to the specified node.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PointMutation

public PointMutation(double probability)
Constructs a new point mutation instance.

Parameters:
probability - the probability of mutating a node in the tree
Method Detail

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

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

mutate

protected void mutate(Node node,
                      Rules rules)
Applies point mutation to the specified node.

Parameters:
node - the node undergoing point mutation
rules - the rules defining the program syntax

MOEA Framework 2.12
API Specification

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Licensed under the GNU Lesser General Public License.
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