cern.jet.random

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

Author:

wolfgang.hoschek@cern.ch

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected double	my_p
protected static Logarithmic	shared

Fields inherited from class cern.jet.random.AbstractDistribution

randomGenerator

Fields inherited from class cern.colt.PersistentObject

serialVersionUID

Constructor Summary

Constructors

Constructor and Description
Logarithmic(double p, RandomEngine randomGenerator) Constructs a Logarithmic distribution.

Method Summary

Methods

Modifier and Type	Method and Description
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.AbstractDistribution

apply, apply, clone, getRandomGenerator, makeDefaultGenerator, nextInt, setRandomGenerator

Methods inherited from class java.lang.Object

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

Field Detail

my_p

protected double my_p

shared

protected static Logarithmic shared

Constructor Detail

Logarithmic

public Logarithmic(double p,
           RandomEngine randomGenerator)

Constructs a Logarithmic distribution.

Method Detail

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