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## umontreal.iro.lecuyer.randvar
Class ChiGen

    java.lang.Object
      umontreal.iro.lecuyer.randvar.RandomVariateGen
          umontreal.iro.lecuyer.randvar.ChiGen

Direct Known Subclasses:
  ChiRatioOfUniformsGen

    public class ChiGen

extends RandomVariateGen

This class implements random variate generators for the chi distribution. It has ν > 0 degrees of freedom and its density function is

f (x) = e-x2/2xν-1/(2(ν/2)-1Γ(ν/2)) for x > 0

where Γ(x) is the gamma function defined in `GammaGen`.

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

Constructor Summary
`ChiGen(RandomStream s, ChiDist dist)` Create a new generator for the distribution `dist`, using stream `s`.
`ChiGen(RandomStream s, int nu)` Creates a chi random variate generator with ν = `nu` degrees of freedom, using stream `s`.

Method Summary
`int` | `getNu()` Returns the value of ν for this object.
`static double` | `nextDouble(RandomStream s, int nu)` Generates a random variate from the chi distribution with ν = `nu` degrees of freedom, using stream `s`.

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

### ChiGen

    public ChiGen(RandomStream s,
                  int nu)

  Creates a chi random variate generator with ν = `nu` degrees of freedom, using stream `s`.

### ChiGen

    public ChiGen(RandomStream s,
                  ChiDist dist)

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

Method Detail

### nextDouble

    public static double nextDouble(RandomStream s,
                                    int nu)

  Generates a random variate from the chi distribution with ν = `nu` degrees of freedom, using stream `s`.

### getNu

    public int getNu()

  Returns the value of ν for this object.

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