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## cern.jet.random
Class Zeta

    java.lang.Object
      cern.colt.PersistentObject
          cern.jet.random.AbstractDistribution
              cern.jet.random.AbstractDiscreteDistribution
                  cern.jet.random.Zeta

All Implemented Interfaces:
  Cloneable, DoubleFunction, IntFunction, Serializable

public class Zeta
extends AbstractDiscreteDistribution

Zeta distribution.

Valid parameter ranges: `ro > 0` and `pk >= 0`.

If either `ro > 100` or `k > 10000` numerical problems in computing the theoretical moments arise, therefore `ro <= 100` and `k <= 10000` are recommended.

Instance methods operate on a user supplied uniform random number generator; they are unsynchronized.

Static methods operate on a default uniform random number generator; they are synchronized.

Implementation:

Method: Acceptance/Rejection. High performance implementation.
This is a port and adaption of `Zeta.c` from the C-RAND / WIN-RAND library. C-RAND's implementation, in turn, is based upon

J. Dagpunar (1988): Principles of Random Variate Generation, Clarendon Press, Oxford.

Version:
  1.0, 09/24/99
See Also:
  Serialized Form

Field Summary

Fields inherited from class cern.colt.PersistentObject
`serialVersionUID`

Constructor Summary
`Zeta(double ro, double pk, RandomEngine randomGenerator)` Constructs a Zeta distribution.

Method Summary
`int` | `nextInt()` Returns a random number from the distribution.
`void` | `setState(double ro, double pk)` Sets the parameters.
`static int` | `staticNextInt(double ro, double pk)` Returns a random number from the distribution.
`String` | `toString()` Returns a String representation of the receiver.

Methods inherited from class cern.jet.random.AbstractDiscreteDistribution
`nextDouble`

Methods inherited from class cern.jet.random.AbstractDistribution
`apply, apply, clone, makeDefaultGenerator`

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

Constructor Detail

### Zeta

    public Zeta(double ro,
                double pk,
                RandomEngine randomGenerator)

  Constructs a Zeta distribution.

Method Detail

### nextInt

    public int nextInt()

  Returns a random number from the distribution.

  Specified by:
    `nextInt` in class `AbstractDiscreteDistribution`

### setState

    public void setState(double ro,
                         double pk)

  Sets the parameters.

### staticNextInt

    public static int staticNextInt(double ro,
                                    double pk)

  Returns a random number from the distribution.

### toString

    public String toString()

  Returns a String representation of the receiver.

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