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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.
Method Summary | |
int |
getIndex(int threadnum)
Functionality: retrieve the index for a specific threanum. |
int |
getIndexRandomNeighbor(EvolutionState state,
int threadnum,
int distance)
Input: the maximum distance for neighbors. |
java.lang.Object |
indexToLocation(int index)
The Space provide a bijectional mapping from indexes in the subpopulation to locations in space. |
int |
locationToIndex(java.lang.Object location)
The Space should provide a bijectional mapping from locations in space to indexes in the subpopulation. |
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 getRandomIndex method. |
Method Detail |
public int locationToIndex(java.lang.Object location)
public java.lang.Object indexToLocation(int index)
public void setIndex(int threadnum, int index)
public int getIndex(int threadnum)
public int getIndexRandomNeighbor(EvolutionState state, int threadnum, int distance)
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