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SSJ V. 2.6. |
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java.lang.Object umontreal.iro.lecuyer.randvar.RandomVariateGen umontreal.iro.lecuyer.randvar.RandomVariateGenInt umontreal.iro.lecuyer.randvar.NegativeBinomialGen
public class NegativeBinomialGen
This class implements random variate generators having the negative binomial distribution. Its mass function is
where Γ is the gamma function, γ > 0 and 0 <= p <= 1. No local copy of the parameters γ and p is maintained in this class. The (non-static) nextInt method simply calls inverseF on the distribution.
Constructor Summary | |
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NegativeBinomialGen(RandomStream s,
double gamma,
double p)
Creates a negative binomial random variate generator with parameters γ = gamma and p, using stream s. |
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NegativeBinomialGen(RandomStream s,
NegativeBinomialDist dist)
Creates a new generator for the distribution dist, using stream s. |
Method Summary | |
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double |
getGamma()
Returns the parameter γ of this object. |
double |
getP()
Returns the parameter p of this object. |
static int |
nextInt(RandomStream s,
double gamma,
double p)
Generates a new variate from the negative binomial distribution, with parameters γ = gamma and p = p, using stream s. |
Methods inherited from class umontreal.iro.lecuyer.randvar.RandomVariateGenInt |
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getDistribution, nextArrayOfInt, nextInt |
Methods inherited from class umontreal.iro.lecuyer.randvar.RandomVariateGen |
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getStream, nextArrayOfDouble, nextDouble, setStream, toString |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public NegativeBinomialGen(RandomStream s, double gamma, double p)
public NegativeBinomialGen(RandomStream s, NegativeBinomialDist dist)
Method Detail |
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public static int nextInt(RandomStream s, double gamma, double p)
public double getGamma()
public double getP()
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SSJ V. 2.6. |
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