umontreal.iro.lecuyer.randvar

Class BinomialConvolutionGen

java.lang.Object

umontreal.iro.lecuyer.randvar.RandomVariateGen

umontreal.iro.lecuyer.randvar.RandomVariateGenInt

umontreal.iro.lecuyer.randvar.BinomialGen

umontreal.iro.lecuyer.randvar.BinomialConvolutionGen

public class BinomialConvolutionGen
extends BinomialGen

Implements binomial random variate generators using the convolution method. This method generates n Bernouilli random variates with parameter p and adds them up. Its advantages are that it requires little computer memory and no setup time. Its disadvantage is that it is very slow for large n. It makes sense only when n is small.

Constructor Summary

Constructors

Constructor and Description
BinomialConvolutionGen(RandomStream s, BinomialDist dist) Creates a random variate generator for the binomial distribution dist and stream s.
BinomialConvolutionGen(RandomStream s, int n, double p) Creates a binomial random variate generator with parameters n and p, using stream s.

Method Summary

Modifier and Type	Method and Description
int	nextInt() Generates a random number (an integer) from the discrete distribution contained in this object.
static int	nextInt(RandomStream s, int n, double p)

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

getN, getP

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

BinomialConvolutionGen

public BinomialConvolutionGen(RandomStream s,
                              int n,
                              double p)

Creates a binomial random variate generator with parameters n and p, using stream s.

BinomialConvolutionGen

public BinomialConvolutionGen(RandomStream s,
                              BinomialDist dist)

Creates a random variate generator for the binomial distribution dist and 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,
                          int n,
                          double p)