Package elki.math.linearalgebra.pca.weightfunctions

Class ErfcWeight

  • All Implemented Interfaces:
    WeightFunction
    public final class ErfcWeight
extends java.lang.Object
implements WeightFunction
    Gaussian Error Function Weight function, scaled such that the result it 0.1 when the distance is the maximum using: \( \text{erfc}(1.1630871536766736 \frac{\text{distance}}{\max}) \).

    The value of 1.1630871536766736 is erfcinv(0.1), to achieve the intended scaling.

    Since:
    0.2
    Author:
    Erich Schubert

    • Constructor Summary

      Constructors 
      Constructor Description
      ErfcWeight()  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      double getWeight​(double distance, double max, double stddev)
      Get Erfc Weight, using distance / max. stddev is ignored.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • ErfcWeight

        public ErfcWeight()

    • Method Detail

      • getWeight

        public double getWeight​(double distance,
                        double max,
                        double stddev)
        Get Erfc Weight, using distance / max. 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