umontreal.iro.lecuyer.randvar

Class GeometricGen

java.lang.Object

umontreal.iro.lecuyer.randvar.RandomVariateGen

umontreal.iro.lecuyer.randvar.RandomVariateGenInt

umontreal.iro.lecuyer.randvar.GeometricGen

public class GeometricGen
extends RandomVariateGenInt

This class implements a random variate generator for the geometric distribution. Its has parameter p and mass function

p(x) = p(1 - p)^x for x = 0, 1, 2,...,

where 0 <= p <= 1. Random variates are generated by calling inversion on the distribution object.

Constructor Summary

Constructors

Constructor and Description
GeometricGen(RandomStream s, double p) Creates a geometric random variate generator with parameter p, using stream s.
GeometricGen(RandomStream s, GeometricDist dist) Creates a new generator for the distribution dist, using stream s.

Method Summary

Modifier and Type	Method and Description
double	getP() Returns the parameter p of this object.
int	nextInt() Generates a random number (an integer) from the discrete distribution contained in this object.
static int	nextInt(RandomStream s, double p) Generates a geometric random variate with parameter p = p, using stream s, by inversion.

Methods inherited from class umontreal.iro.lecuyer.randvar.RandomVariateGenInt

getDistribution, nextArrayOfInt

Methods inherited from class umontreal.iro.lecuyer.randvar.RandomVariateGen

getStream, nextArrayOfDouble, nextDouble, setStream, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

GeometricGen

public GeometricGen(RandomStream s,
                    double p)

Creates a geometric random variate generator with parameter p, using stream s.

GeometricGen

public GeometricGen(RandomStream s,
                    GeometricDist dist)

Creates a new generator for the distribution dist, using stream s.

Method Detail

nextInt

public int nextInt()

Description copied from class: RandomVariateGenInt

Generates a random number (an integer) from the discrete distribution contained in this object. By default, this method uses inversion by calling the inverseF method of the distribution object. Alternative generating methods are provided in subclasses.

Overrides:

nextInt in class RandomVariateGenInt

Returns:

the generated value

nextInt

public static int nextInt(RandomStream s,
                          double p)

Generates a geometric random variate with parameter p = p, using stream s, by inversion.

getP

public double getP()

Returns the parameter p of this object.