gpsys
Class Fitness

java.lang.Object
  |
  +--gpsys.Fitness
Direct Known Subclasses:
LawnMowerFitness, SymRegFitness
public abstract class Fitness
extends java.lang.Object
implements java.io.Serializable

Represents the fitness of an individual. This class must be subclassed to define the fitness measure for your application.

Version:
$Revision: 1.1 $, $Date: 2000/07/05 16:21:25 $
Author:
Adil Qureshi
Department of Computer Science,
University College London,
Gower St,
London WC1E 6BT,
UK.
See Also:
Serialized Form

Constructor Summary
Fitness()
           
 
Method Summary
abstract  void add(Fitness f)
          Add a fitness value to this fitness value.
abstract  void divide(int divisor)
          Divide the fitness by the specified integer.
abstract  boolean equals(Fitness f)
          Tests if this fitness is equal to another fitness.
abstract  boolean greaterThan(Fitness f)
          Tests if this fitness value is greater than another fitness value.
abstract  Fitness instance()
          Creates a new instance of the Fitness object with a default fitness.
abstract  Fitness instance(GPParameters gpParameters, Individual i)
          Creates a new instance of the Fitness object which represents the fitness of the specified individual.
abstract  boolean lessThan(Fitness f)
          Tests if this fitness is less than another fitness.
abstract  boolean terminationCondition()
          Tests whether this fitness meets the termination criteria.
abstract  java.lang.String toString()
          Converts the fitness into a String suitable for printing.
 
Methods inherited from class java.lang.Object
, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, wait, wait, wait
 

Constructor Detail

Fitness

public Fitness()
Method Detail

add

public abstract void add(Fitness f)
Add a fitness value to this fitness value.
Parameters:
f - the fitness value to be added.

divide

public abstract void divide(int divisor)
Divide the fitness by the specified integer. This is used by the GP system to calculate the average fitness of the population.
Parameters:
divisor - the integer to divide the fitness by.

equals

public abstract boolean equals(Fitness f)
Tests if this fitness is equal to another fitness.
Parameters:
f - the fitness with which to compare.
Returns:
true if f has the same fitness, false otherwise.

lessThan

public abstract boolean lessThan(Fitness f)
Tests if this fitness is less than another fitness.
Parameters:
f - the fitness with which to compare.
Returns:
true if f has less fitness, false otherwise.

greaterThan

public abstract boolean greaterThan(Fitness f)
Tests if this fitness value is greater than another fitness value.
Parameters:
f - the fitness with which to compare.
Returns:
true if f has higher fitness, false otherwise.

instance

public abstract Fitness instance()
Creates a new instance of the Fitness object with a default fitness.
Returns:
an instance of a Fitness object with default fitness.

instance

public abstract Fitness instance(GPParameters gpParameters,
                                 Individual i)
Creates a new instance of the Fitness object which represents the fitness of the specified individual.
Parameters:
gpParameters - the parameters for this GP run.
i - the individual to be evaluated.
Returns:
The Fitness of the specified individual.

terminationCondition

public abstract boolean terminationCondition()
Tests whether this fitness meets the termination criteria.
Returns:
true if the termination criteria has been met, false otherwise.

toString

public abstract java.lang.String toString()
Converts the fitness into a String suitable for printing.
Returns:
A String representing the fitness.
Overrides:
toString in class java.lang.Object