Class Logarithmic

java.lang.Object
cern.colt.PersistentObject
cern.jet.random.AbstractDistribution
cern.jet.random.AbstractContinousDistribution
cern.jet.random.Logarithmic
All Implemented Interfaces:
DoubleFunction, IntFunction, Serializable, Cloneable
public class Logarithmic extends AbstractContinousDistribution
Logarithmic distribution.

Valid parameter ranges: 0 < p < 1.

Instance methods operate on a user supplied uniform random number generator; they are unsynchronized.

Static methods operate on a default uniform random number generator; they are synchronized.

Implementation:

Method: Inversion/Transformation.
This is a port of lsk.c from the C-RAND / WIN-RAND library. C-RAND's implementation, in turn, is based upon

A.W. Kemp (1981): Efficient generation of logarithmically distributed pseudo-random variables, Appl. Statist. 30, 249-253.

Version:
1.0, 09/24/99
See Also:

  • Field Details

    • my_p

      protected double my_p

    • t

      private double t

    • h

      private double h

    • a_prev

      private double a_prev

    • shared

      protected static Logarithmic shared

  • Constructor Details

    • Logarithmic

      public Logarithmic(double p, RandomEngine randomGenerator)
      Constructs a Logarithmic distribution.

  • Method Details

    • nextDouble

      public double nextDouble()
      Returns a random number from the distribution.
      Specified by:
      nextDouble in class AbstractDistribution

    • nextDouble

      public double nextDouble(double a)
      Returns a random number from the distribution; bypasses the internal state.

    • setState

      public void setState(double p)
      Sets the distribution parameter.

    • staticNextDouble

      public static double staticNextDouble(double p)
      Returns a random number from the distribution.

    • toString

      public String toString()
      Returns a String representation of the receiver.
      Overrides:
      toString in class Object

    • xstaticSetRandomGenerator

      private static void xstaticSetRandomGenerator(RandomEngine randomGenerator)
      Sets the uniform random number generated shared by all static methods.
      Parameters:
      randomGenerator - the new uniform random number generator to be shared.