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

Class QuadraticWeight

java.lang.Object

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

All Implemented Interfaces:

WeightFunction

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

Quadratic weight function, scaled using the maximum to reach 0.1 at that point.

1.0 - 0.9 * (distance/max)²

Since:

0.2

Author:

Erich Schubert

Constructor Summary

Constructors

Constructor and Description
QuadraticWeight()

Method Summary

Modifier and Type	Method and Description
double	getWeight(double distance, double max, double stddev) Evaluate quadratic weight. stddev is ignored.

Methods inherited from class java.lang.Object

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

Constructor Detail

QuadraticWeight

public QuadraticWeight()

Method Detail

getWeight

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

Evaluate quadratic weight. 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