cern.jet.random.tdouble
Class Logarithmic

java.lang.Object
  cern.colt.PersistentObject
      cern.jet.random.tdouble.AbstractDoubleDistribution
          cern.jet.random.tdouble.AbstractContinousDoubleDistribution
              cern.jet.random.tdouble.Logarithmic

All Implemented Interfaces:

DoubleFunction, IntFunction, Serializable, Cloneable

public class Logarithmic
extends AbstractContinousDoubleDistribution

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

Author:

wolfgang.hoschek@cern.ch

See Also:

Serialized Form

Constructor Summary

Logarithmic(double p, DoubleRandomEngine randomGenerator)
Constructs a Logarithmic distribution.

Method Summary

double	nextDouble() Returns a random number from the distribution.
double	nextDouble(double a) Returns a random number from the distribution; bypasses the internal state.
void	setState(double p) Sets the distribution parameter.
static double	staticNextDouble(double p) Returns a random number from the distribution.
String	toString() Returns a String representation of the receiver.

Methods inherited from class cern.jet.random.tdouble.AbstractDoubleDistribution

apply, apply, clone, makeDefaultGenerator, nextInt

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Logarithmic

public Logarithmic(double p,
                   DoubleRandomEngine randomGenerator)

Constructs a Logarithmic distribution.

Method Detail

nextDouble

public double nextDouble()

Returns a random number from the distribution.

Specified by:

nextDouble in class AbstractDoubleDistribution

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