de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions

Class ErfcStddevWeight

java.lang.Object

de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.ErfcStddevWeight

All Implemented Interfaces:

WeightFunction

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

Gaussian Error Function Weight function, scaled using stddev. This probably is the most statistically sound weight. erfc(1 / sqrt(2) * distance / stddev)

Since:

0.2

Author:

Erich Schubert

Constructor Summary

Constructors

Constructor and Description
ErfcStddevWeight()

Method Summary

Modifier and Type	Method and Description
double	getWeight(double distance, double max, double stddev) Return Erfc weight, scaled by standard deviation. max is ignored.

Methods inherited from class java.lang.Object

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

Constructor Detail

ErfcStddevWeight

public ErfcStddevWeight()

Method Detail

getWeight

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

Return Erfc weight, scaled by standard deviation. 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