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

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

public final class ExponentialStddevWeight
extends Object
implements WeightFunction

Exponential Weight function, scaled such that the result it 0.1 at distance == max stddev * exp(-.5 * distance/stddev) This is similar to the Gaussian weight function, except distance/stddev is not squared.


Constructor Summary
ExponentialStddevWeight()
           
 
Method Summary
 double getWeight(double distance, double max, double stddev)
          Get exponential weight, max is ignored.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ExponentialStddevWeight

public ExponentialStddevWeight()
Method Detail

getWeight

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

Release 0.4.0 (2011-09-20_1324)