Package elki.math.linearalgebra.pca.weightfunctions

Class ErfcStddevWeight

  • All Implemented Interfaces:
    WeightFunction
    public final class ErfcStddevWeight
extends java.lang.Object
implements WeightFunction
    Gaussian Error Function Weight function, scaled using stddev using: \( \text{erfc}(\frac{1}{\sqrt{2}} \frac{\text{distance}}{\sigma}) \).

    This probably is the most statistically sound weight.

    Since:
    0.2
    Author:
    Erich Schubert

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      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