Class LockingExactGenotypeMutator

All Implemented Interfaces:
GeneticOperator, java.io.Serializable

public class LockingExactGenotypeMutator
extends java.lang.Object
implements GeneticOperator

This Genetic Operator will look at the bits of the elite through generations and record the last time they changed. This 'age' of the bits is used to modify the probability of them being mutated.

The probability of being mutated is modified in the following way:

If a bit is selected for mutation, then the probability of this mutation being rejected (and another picked later) is calculated as 1/(age/alpha+1) where age is the number of generations since this selected bit was last mutated and alpha is the half-life, which is the age at which we expect 1/2 chance of rejection. For example if alpha=1000 then after 1000 generations with a bit not having changed, if it is chosen for mutation there is a half-half chance it will be rejected and another chosen instead.

See Also:
Serialized Form

Constructor Summary
LockingExactGenotypeMutator(int mutsPerGen, int halfLife)
          Creates new LockingExactGenotypeMutator
Method Summary
 void operate(Selector selector, Population oldPopulation, Population newPopulation, int howMany)
          method that adds genotypes to the new population by extracting some from the old one and manipulating them in some way.
 java.lang.String toString()
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail


public LockingExactGenotypeMutator(int mutsPerGen,
                                   int halfLife)
Creates new LockingExactGenotypeMutator
Method Detail


public void operate(Selector selector,
                    Population oldPopulation,
                    Population newPopulation,
                    int howMany)
method that adds genotypes to the new population by extracting some from the old one and manipulating them in some way.
Specified by:
operate in interface GeneticOperator
oldPopulation - in parameter having all the original genotypes
newPopulation - in/out parameter where the next generation of genotypes is being built
howMany - how many new genotypes to add to the new population


public java.lang.String toString()
toString in class java.lang.Object