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

Interface WeightFunction

All Known Implementing Classes:

ConstantWeight, ErfcStddevWeight, ErfcWeight, ExponentialStddevWeight, ExponentialWeight, GaussStddevWeight, GaussWeight, InverseLinearWeight, InverseProportionalStddevWeight, InverseProportionalWeight, LinearWeight, QuadraticStddevWeight, QuadraticWeight

public interface WeightFunction

WeightFunction interface that allows the use of various distance-based weight functions. In addition to the distance parameter, the maximum distance and standard deviation are also given, to allow distance functions to be normalized according to the maximum or standard deviation.

Since:

0.2

Author:

Erich Schubert

Method Summary

Modifier and Type	Method and Description
double	getWeight(double distance, double max, double stddev) Evaluate weight function with given parameters.

Method Detail

getWeight

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

Evaluate weight function with given parameters. Note that usually implementations will ignore either max or stddev.

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