Package sim.util.distribution
Class Zeta
java.lang.Object
sim.util.distribution.AbstractDistribution
sim.util.distribution.AbstractDiscreteDistribution
sim.util.distribution.Zeta
- All Implemented Interfaces:
Serializable
Zeta distribution.
If either ro > 100 or k > 10000 numerical problems in
computing the theoretical moments arise, therefore ro <= 100 and
k <= 10000 are recommended.
Static methods operate on a default uniform random number generator; they are synchronized.
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
Valid parameter ranges: ro > 0 and pk >= 0.
Instance methods operate on a user supplied uniform random number generator; they are unsynchronized.
Implementation:
J. Dagpunar (1988): Principles of Random Variate Generation, Clarendon Press, Oxford.
- See Also:
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Field Summary
Modifier and TypeFieldDescriptionprotected double
protected double
protected double
protected double
protected double
protected double
protected double
Fields inherited from class sim.util.distribution.AbstractDistribution
randomGenerator
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Constructor Summary
ConstructorDescriptionZeta
(double ro, double pk, MersenneTwisterFast randomGenerator) Constructs a Zeta distribution. -
Method Summary
Modifier and TypeMethodDescriptionprotected long
generateZeta
(double ro, double pk, MersenneTwisterFast randomGenerator) Returns a zeta distributed random number.int
nextInt()
Returns a random number from the distribution.void
setState
(double ro, double pk) Sets the parameters.toString()
Returns a String representation of the receiver.Methods inherited from class sim.util.distribution.AbstractDiscreteDistribution
nextDouble
Methods inherited from class sim.util.distribution.AbstractDistribution
apply, apply, getRandomGenerator, setRandomGenerator
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Field Details
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ro
protected double ro -
pk
protected double pk -
c
protected double c -
d
protected double d -
ro_prev
protected double ro_prev -
pk_prev
protected double pk_prev -
maxlongint
protected double maxlongint
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Constructor Details
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Zeta
Constructs a Zeta distribution.
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Method Details
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generateZeta
Returns a zeta distributed random number. -
nextInt
public int nextInt()Returns a random number from the distribution.- Specified by:
nextInt
in classAbstractDiscreteDistribution
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setState
public void setState(double ro, double pk) Sets the parameters. -
toString
Returns a String representation of the receiver.
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