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

java.lang.Object
  extended by de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.ErfcStddevWeight
All Implemented Interfaces:
WeightFunction, InspectionUtilFrequentlyScanned

public final class ErfcStddevWeight
extends 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)


Constructor Summary
ErfcStddevWeight()
           
 
Method Summary
 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

Release 0.4.0 (2011-09-20_1324)