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

java.lang.Object
  de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.ErfcWeight

All Implemented Interfaces:

WeightFunction

public final class ErfcWeight
extends Object
implements WeightFunction

Gaussian Error Function Weight function, scaled such that the result it 0.1 at distance == max erfc(1.1630871536766736 * distance / max) The value of 1.1630871536766736 is erfcinv(0.1), to achieve the intended scaling.

Author:

Erich Schubert

Constructor Summary

ErfcWeight()

Method Summary

double

getWeight(double distance, double max, double stddev) Get Erfc Weight, using distance / max. stddev is ignored.

Methods inherited from class java.lang.Object

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

Constructor Detail

ErfcWeight

public ErfcWeight()

Method Detail

getWeight

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

Get Erfc Weight, using distance / max. stddev 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