sim.util.distribution
Class Logarithmic

java.lang.Object
  sim.util.distribution.AbstractDistribution
      sim.util.distribution.AbstractContinousDistribution
          sim.util.distribution.Logarithmic

All Implemented Interfaces:

java.io.Serializable

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.

See Also:

Serialized Form

Field Summary

protected double

my_p

Fields inherited from class sim.util.distribution.AbstractDistribution

randomGenerator

Constructor Summary

Logarithmic(double p, MersenneTwisterFast 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.
java.lang.String	toString() Returns a String representation of the receiver.

Methods inherited from class sim.util.distribution.AbstractDistribution

apply, apply, getRandomGenerator, nextInt, setRandomGenerator

Methods inherited from class java.lang.Object

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

Field Detail

my_p

protected double my_p

Constructor Detail

Logarithmic

public Logarithmic(double p,
                   MersenneTwisterFast 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.

toString

public java.lang.String toString()

Returns a String representation of the receiver.

Overrides:

toString in class java.lang.Object