com.pervasive.datarush.analytics.knn

Interface NearnessMeasure.Measurer

Enclosing class:

NearnessMeasure

public static interface NearnessMeasure.Measurer

A calculator of "nearness".

Method Summary

Modifier and Type	Method and Description
double	measureNearness(DoubleValuedIterator pt1, DoubleValuedIterator pt2) Calculates the "nearness" of the two points.

Method Detail

measureNearness

double measureNearness(DoubleValuedIterator pt1,
                       DoubleValuedIterator pt2)

Calculates the "nearness" of the two points. The returned value should be non-negative, with smaller values indicating the points are "nearer". A value of zero indicates "identical" points.

As long as distance ordering is preserved, it is not necessary to return a true distance. If a true distance is required, the NearnessMeasure.nearnessToDistance(double) method will be used to convert.

Parameters:

pt1 - one point in the measurement

pt2 - the other point in the measurement

Returns:

the "nearness" of the points