Package elki.math.statistics.distribution

Class ConstantDistribution

  • All Implemented Interfaces:
    Distribution
    public class ConstantDistribution
extends java.lang.Object
implements Distribution
    Pseudo distribution, that has a unique constant value.
    Since:
    0.5.0
    Author:
    Erich Schubert

    • Field Summary

      Fields 
      Modifier and Type Field Description
      (package private) double c
      The constant

    • Constructor Summary

      Constructors 
      Constructor Description
      ConstantDistribution​(double c)
      Constructor.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      double cdf​(double val)
      Return the cumulative density function at the given value.
      double logpdf​(double val)
      Return the log density of an existing value
      double nextRandom​(java.util.Random random)
      Generate a new random value
      double pdf​(double val)
      Return the density of an existing value
      double pmf​(double val)
      Probability mass function.
      double quantile​(double val)
      Quantile aka probit (for normal) aka inverse CDF (invcdf, cdf^-1) function.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • c

        final double c
        The constant

    • Constructor Detail

      • ConstantDistribution

        public ConstantDistribution​(double c)
        Constructor.
        Parameters:
        c - Constant

    • Method Detail

      • nextRandom

        public double nextRandom​(java.util.Random random)
        Description copied from interface: Distribution
        Generate a new random value
        Specified by:
        nextRandom in interface Distribution
        Parameters:
        random - Random number generator
        Returns:
        new random value

      • pmf

        public double pmf​(double val)
        Probability mass function.
        Parameters:
        val - Value
        Returns:
        probability mass pmf(val)

      • pdf

        public double pdf​(double val)
        Description copied from interface: Distribution
        Return the density of an existing value
        Specified by:
        pdf in interface Distribution
        Parameters:
        val - existing value
        Returns:
        distribution density

      • logpdf

        public double logpdf​(double val)
        Description copied from interface: Distribution
        Return the log density of an existing value
        Specified by:
        logpdf in interface Distribution
        Parameters:
        val - existing value
        Returns:
        log distribution density

      • cdf

        public double cdf​(double val)
        Description copied from interface: Distribution
        Return the cumulative density function at the given value.
        Specified by:
        cdf in interface Distribution
        Parameters:
        val - existing value
        Returns:
        cumulative density

      • quantile

        public double quantile​(double val)
        Description copied from interface: Distribution
        Quantile aka probit (for normal) aka inverse CDF (invcdf, cdf^-1) function.
        Specified by:
        quantile in interface Distribution
        Parameters:
        val - Quantile to find
        Returns:
        Quantile position