ec.spatial

Class Spatial1DSubpopulation

java.lang.Object

ec.Subpopulation

ec.spatial.Spatial1DSubpopulation

All Implemented Interfaces:

Group, Setup, Space, Serializable, Cloneable

public class Spatial1DSubpopulation
extends Subpopulation
implements Space

A Spatial1DSubpopulation is an EC subpopulation that is additionally embedded into a one-dimmensional space. In a spatially-embedded EA, the subpopulations of individuals are assumed to be spatially distributed in some sort of space, be it one-dimmensional, two- dimmensional, or whatever else. The space may or may not be toroidal (although it usually is). Each location in the space has a set of neighboring locations. Thus, each individual has an index in the subpopulation, and also a location in the space.

This public interface provides a method to obtain the indexes of the neighbors of a location.

This Subpopulation does not include toroidalness in writing out to streams.

Parameters

Version:

1.0

Author:

Liviu Panait

See Also:

Serialized Form

Field Summary

toroidal true (default) or false

(Is this space toroidal?)

Fields

Modifier and Type	Field and Description
(package private) int[]	indexes
static String	P_TOROIDAL This parameter stipulates whether the world is toroidal or not.
boolean	toroidal

Fields inherited from class ec.Subpopulation

extraBehavior, file, FILL, INDIVIDUAL_INDEX_PREAMBLE, individuals, loadInds, NUM_INDIVIDUALS_PREAMBLE, numDuplicateRetries, P_EXTRA_BEHAVIOR, P_FILE, P_RETRIES, P_SPECIES, P_SUBPOPSIZE, P_SUBPOPULATION, species, TRUNCATE, V_FILL, V_TRUNCATE, V_WRAP, WRAP

Constructor Summary

Constructors

Constructor and Description
Spatial1DSubpopulation()

Method Summary

Methods

Modifier and Type	Method and Description
int	getIndex(int threadnum) Functionality: retrieve the index for a specific threanum.
int	getIndexRandomNeighbor(EvolutionState state, int threadnum, int distance) Returns a the index of a random neighbor.
void	setIndex(int threadnum, int index) Input: a threadnumber (either for evaluation or for breeding), and an index in a subpopulation (the index in the subpopulation is, of course, associated with a location in the space) Functionality: stores the index and the threadnumber for further accesses to the getIndexRandomNeighbor method.
void	setup(EvolutionState state, Parameter base) Read additional parameters for the spatially-embedded subpopulation.

Methods inherited from class ec.Subpopulation

clear, defaultBase, emptyClone, populate, printSubpopulation, printSubpopulation, printSubpopulation, printSubpopulationForHumans, printSubpopulationForHumans, readSubpopulation, readSubpopulation, writeSubpopulation

Methods inherited from class java.lang.Object

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

Field Detail

P_TOROIDAL

public static final String P_TOROIDAL

This parameter stipulates whether the world is toroidal or not. If missing, its default value is true.

See Also:

Constant Field Values

toroidal

public boolean toroidal

indexes

int[] indexes

Constructor Detail

Spatial1DSubpopulation

public Spatial1DSubpopulation()

Method Detail

setup

public void setup(EvolutionState state,
         Parameter base)

Read additional parameters for the spatially-embedded subpopulation.

Specified by:

setup in interface Setup

Overrides:

setup in class Subpopulation

setIndex

public void setIndex(int threadnum,
            int index)

Description copied from interface: Space

Input: a threadnumber (either for evaluation or for breeding), and an index in a subpopulation (the index in the subpopulation is, of course, associated with a location in the space) Functionality: stores the index and the threadnumber for further accesses to the getIndexRandomNeighbor method. All such accesses from the specific thread will use the exact same index, until this function is called again to change the index.

Specified by:

setIndex in interface Space

getIndex

public int getIndex(int threadnum)

Description copied from interface: Space

Functionality: retrieve the index for a specific threanum. Returns -1 if any error is encountered.

Specified by:

getIndex in interface Space

getIndexRandomNeighbor

public int getIndexRandomNeighbor(EvolutionState state,
                         int threadnum,
                         int distance)

Returns a the index of a random neighbor.

Specified by:

getIndexRandomNeighbor in interface Space