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## umontreal.iro.lecuyer.randvar
Class ErlangGen

    java.lang.Object
      umontreal.iro.lecuyer.randvar.RandomVariateGen
          umontreal.iro.lecuyer.randvar.GammaGen
              umontreal.iro.lecuyer.randvar.ErlangGen

Direct Known Subclasses:
  ErlangConvolutionGen

    public class ErlangGen

extends GammaGen

This class implements random variate generators for the Erlang distribution with parameters k > 0 and λ > 0. This Erlang random variable is the sum of k exponentials with parameter λ and has mean k/λ.

The (non-static) `nextDouble` method simply calls `inverseF` on the distribution.

Constructor Summary
`ErlangGen(RandomStream s, ErlangDist dist)` Creates a new generator for the distribution `dist` and stream `s`.
`ErlangGen(RandomStream s, int k)` Creates an Erlang random variate generator with parameters `k` and λ = 1, using stream `s`.
`ErlangGen(RandomStream s, int k, double lambda)` Creates an Erlang random variate generator with parameters `k` and λ = `lambda`, using stream `s`.

Method Summary
`int` | `getK()` Returns the parameter k of this object.
`static double` | `nextDouble(RandomStream s, int k, double lambda)` Generates a new variate from the Erlang distribution with parameters k = `k` and λ = `lambda`, using stream `s`.

Methods inherited from class umontreal.iro.lecuyer.randvar.GammaGen
`getAlpha, getLambda, nextDouble`

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

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

Constructor Detail

### ErlangGen

    public ErlangGen(RandomStream s,
                     int k,
                     double lambda)

  Creates an Erlang random variate generator with parameters `k` and λ = `lambda`, using stream `s`.

### ErlangGen

    public ErlangGen(RandomStream s,
                     int k)

  Creates an Erlang random variate generator with parameters `k` and λ = 1, using stream `s`.

### ErlangGen

    public ErlangGen(RandomStream s,
                     ErlangDist dist)

  Creates a new generator for the distribution `dist` and stream `s`.

Method Detail

### nextDouble

    public static double nextDouble(RandomStream s,
                                    int k,
                                    double lambda)

  Generates a new variate from the Erlang distribution with parameters k = `k` and λ = `lambda`, using stream `s`.

### getK

    public int getK()

  Returns the parameter k of this object.

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