Package elki.math.linearalgebra.pca.weightfunctions

Class InverseProportionalStddevWeight

java.lang.Object

elki.math.linearalgebra.pca.weightfunctions.InverseProportionalStddevWeight

All Implemented Interfaces:

WeightFunction

public final class InverseProportionalStddevWeight
extends java.lang.Object
implements WeightFunction

Inverse proportional weight function, scaled using the standard deviation using: \( 1 / (1 + \frac{distance}{\sigma}) \)

Since:

0.2

Author:

Erich Schubert

Constructor Summary

Constructors

Constructor	Description
InverseProportionalStddevWeight()

Method Summary

Modifier and Type	Method	Description
double	getWeight(double distance, double max, double stddev)	Get inverse proportional weight. max is ignored.

Methods inherited from class java.lang.Object

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

Constructor Detail

InverseProportionalStddevWeight

public InverseProportionalStddevWeight()

Method Detail

getWeight

public double getWeight(double distance,
                        double max,
                        double stddev)

Get inverse proportional weight. max is ignored.

Specified by:

getWeight in interface WeightFunction

Parameters:

distance - distance of the query point

max - maximum distance of all included points

stddev - standard deviation (i.e. quadratic mean / RMS) of the included points

Returns:

weight for the query point