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## umontreal.iro.lecuyer.randvar
Class PoissonGen

    java.lang.Object
      umontreal.iro.lecuyer.randvar.RandomVariateGen
          umontreal.iro.lecuyer.randvar.RandomVariateGenInt
              umontreal.iro.lecuyer.randvar.PoissonGen

Direct Known Subclasses:
  PoissonTIACGen

    public class PoissonGen

extends RandomVariateGenInt

This class implements random variate generators having the Poisson distribution. Its mass function is

p(x) = e-λλx/(x!) for x = 0, 1,...

where λ > 0 is a real valued parameter equal to the mean.

No local copy of the parameter λ = `lambda` is maintained in this class. The (non-static) `nextInt` method simply calls `inverseF` on the distribution.

Constructor Summary
`PoissonGen(RandomStream s, double lambda)` Creates a Poisson random variate generator with parameter λ = `lambda`, using stream `s`.
`PoissonGen(RandomStream s, PoissonDist dist)` Creates a new random variate generator using the Poisson distribution `dist` and stream `s`.

Method Summary
`double` | `getLambda()` Returns the λ associated with this object.
`static int` | `nextInt(RandomStream s, double lambda)` A static method for generating a random variate from a Poisson distribution with parameter λ = `lambda`.

Methods inherited from class umontreal.iro.lecuyer.randvar.RandomVariateGenInt
`getDistribution, nextArrayOfInt, nextInt`

Methods inherited from class umontreal.iro.lecuyer.randvar.RandomVariateGen
`getStream, nextArrayOfDouble, nextDouble, setStream`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### PoissonGen

    public PoissonGen(RandomStream s,
                      double lambda)

  Creates a Poisson random variate generator with parameter λ = `lambda`, using stream `s`.

### PoissonGen

    public PoissonGen(RandomStream s,
                      PoissonDist dist)

  Creates a new random variate generator using the Poisson distribution `dist` and stream `s`.

Method Detail

### nextInt

    public static int nextInt(RandomStream s,
                              double lambda)

  A static method for generating a random variate from a Poisson distribution with parameter λ = `lambda`.

### getLambda

    public double getLambda()

  Returns the λ associated with this object.

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To submit a bug or ask questions, send an e-mail to Pierre L'Ecuyer.