umontreal.iro.lecuyer.randvar
Class PascalConvolutionGen

java.lang.Object
  umontreal.iro.lecuyer.randvar.RandomVariateGen
      umontreal.iro.lecuyer.randvar.RandomVariateGenInt
          umontreal.iro.lecuyer.randvar.PascalGen
              umontreal.iro.lecuyer.randvar.PascalConvolutionGen

public class PascalConvolutionGen
extends PascalGen

Implements Pascal random variate generators by the convolution method. The method generates n geometric variates with probability p and adds them up.

The algorithm is slow if n is large.

Constructor Summary

PascalConvolutionGen(RandomStream s, int n, double p)
Creates a Pascal random variate generator with parameters n and p, using stream s.

PascalConvolutionGen(RandomStream s, PascalDist dist)
Creates a new generator for the distribution dist, using stream s.

Method Summary

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.PascalGen

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

PascalConvolutionGen

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

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

PascalConvolutionGen

public PascalConvolutionGen(RandomStream s,
                            PascalDist 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,
                          int n,
                          double p)