edu.udo.cs.yale.tools.math.som
Interface DistanceFunction

All Known Implementing Classes:

EuclideanDistance

public interface DistanceFunction

This interface defines the methods of an distance measure class. All three methods should return the same distance if equivalent inputs are given. The third method should regard the wrap around, as if there were no bounds, instead point (0,0) should be neighbour of point (n,n)!

Version:

$Id$

Author:

Sebastian Land

Method Summary

double	getDistance(double[] point1, double[] point2) This method returns the distance between point1 and point2.
double	getDistance(int[] point1, int[] point2) This method returns the distance between point1 and point2.
double	getDistance(int[] point1, int[] point2, int[] dimensions) This method returns the distance between point1 and point2.

Method Detail

getDistance

double getDistance(double[] point1,
                   double[] point2)

This method returns the distance between point1 and point2. The dimenson of the points is represented by the length of the arrays. This method should return the same value as the method below, if points are equivalent!

getDistance

double getDistance(int[] point1,
                   int[] point2)

This method returns the distance between point1 and point2. The dimenson of the points is represented by the length of the arrays. This method should return the same value as the method above, if points are equivalent!

getDistance

double getDistance(int[] point1,
                   int[] point2,
                   int[] dimensions)

This method returns the distance between point1 and point2. The dimsion of the points is represented by the length of the arrays. This method has to be aware of the size of each dimension! Points on the border are neighbours to the point at the opposite site! As example: (0, x) is neighbour of (dimensions[0], x), too. Hence, the resulting distance is 1.