gpsys
Class ChromosomeParameters

java.lang.Object
  |
  +--gpsys.ChromosomeParameters

Direct Known Subclasses:

LawnMowerChromosomeParametersADF0, LawnMowerChromosomeParametersADF1, LawnMowerChromosomeParametersADF2, SymRegChromosomeParametersADF0

public class ChromosomeParameters

extends java.lang.Object

implements java.io.Serializable

ChromosomeParameters define information needed to construct a chromosome. Users should extend this class for each ADF to be defined.

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:

gpsys.Chromsome, GPParameters, Serialized Form

Field Summary

static int	CREATE_FULL This constant used to initialise the createMethod variable to select the full method of creation.
static int	CREATE_GROW This constant used to initialise the createMethod variable to select the grow method of creation.
static int	CREATE_RAMP_HALF_AND_HALF This constant used to initialise the createMethod variable to select the ramp method of creation.
int	createMethod The method of Chromosome creation, this can be initialised to any of the following constants.
Function[]	functions The table of available functions.
TypeToFunctionsTable[]	functionsOfTypeAtDepthFull Functions of a given return type possible at a given depth for both the FULL creation method.
TypeToFunctionsTable[]	functionsOfTypeAtDepthGrow Functions of a given return type possible at a given depth for both the GROW creation method.
int	maxDepth The maximum depth of the Gene tree.
int	maxDepthAtCreation The maximum depth at creation of the Gene tree.
int	maxDepthMutation The maximum depth of tree created to mutate the Gene tree.
Terminal[]	terminals The table of available terminals.
TypeToTerminalsTable	terminalsOfType A hash table mapping a given Type to an array of terminals of that Type.
Type	type The type to be returned by the Chromosome.
Type[]	types The table of available types.

Constructor Summary

ChromosomeParameters()

Method Summary

private void	initialiseFunctionsTypeTable(int maxDepthAtCreation)
private void	initialiseFunctionsTypeTableFull(int maxDepthAtCreation)
private void	initialiseFunctionsTypeTableGrow(int maxDepthAtCreation)
private void	initialiseTerminalsTypeTable()
void	initialiseTypeTables(int maxDepthAtCreation) Initialises the type possibilities tables, read the "Strongly Typed Genetic Programing" paper by David J.

Methods inherited from class java.lang.Object

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

Field Detail

type

public Type type

The type to be returned by the Chromosome.

See Also:

Type

maxDepth

public int maxDepth

The maximum depth of the Gene tree.

maxDepthAtCreation

public int maxDepthAtCreation

The maximum depth at creation of the Gene tree.

maxDepthMutation

public int maxDepthMutation

The maximum depth of tree created to mutate the Gene tree.

functions

public Function[] functions

The table of available functions.

terminals

public Terminal[] terminals

The table of available terminals.

types

public Type[] types

The table of available types.

functionsOfTypeAtDepthGrow

public TypeToFunctionsTable[] functionsOfTypeAtDepthGrow

Functions of a given return type possible at a given depth for both the GROW creation method. The index = the required depth, the array contains a hash table mapping Types to Function arrays - note that not all functions of given return type possible at a given depth.

functionsOfTypeAtDepthFull

public TypeToFunctionsTable[] functionsOfTypeAtDepthFull

Functions of a given return type possible at a given depth for both the FULL creation method. The index = the required depth, the array contains a hash table mapping Types to Function arrays - note that not all functions of given return type possible at a given depth.

terminalsOfType

public TypeToTerminalsTable terminalsOfType

A hash table mapping a given Type to an array of terminals of that Type.

createMethod

public int createMethod

The method of Chromosome creation, this can be initialised to any of the following constants.

CREATE_FULL

public static final int CREATE_FULL

This constant used to initialise the createMethod variable to select the full method of creation. The full method creates Gene trees of the maximum available depth.

CREATE_GROW

public static final int CREATE_GROW

This constant used to initialise the createMethod variable to select the grow method of creation. The grow method creates Gene trees of variable depths.

CREATE_RAMP_HALF_AND_HALF

public static final int CREATE_RAMP_HALF_AND_HALF

This constant used to initialise the createMethod variable to select the ramp method of creation. The ramp half and half method creates Gene trees in the population of which half are created using the full method and the other half are created using the grow method. The depth of these trees is varied between 2 and maxDepthAtCreation.

Constructor Detail

ChromosomeParameters

public ChromosomeParameters()

Method Detail

initialiseTypeTables

public void initialiseTypeTables(int maxDepthAtCreation)

Initialises the type possibilities tables, read the "Strongly Typed Genetic Programing" paper by David J. Montana.

Parameters:

maxDepthAtCreation - the maximum depth at creation of the Gene trees.

initialiseTerminalsTypeTable

private void initialiseTerminalsTypeTable()

initialiseFunctionsTypeTable

private void initialiseFunctionsTypeTable(int maxDepthAtCreation)

initialiseFunctionsTypeTableFull

private void initialiseFunctionsTypeTableFull(int maxDepthAtCreation)

initialiseFunctionsTypeTableGrow

private void initialiseFunctionsTypeTableGrow(int maxDepthAtCreation)