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java.lang.Objectcern.colt.PersistentObject
cern.jet.random.AbstractDistribution
cern.jet.random.AbstractDiscreteDistribution
cern.jet.random.PoissonSlow
Poisson distribution; See the math definition and animated definition.
p(k) = (mean^k / k!) * exp(-mean) for k >= 0.
Valid parameter ranges: mean > 0. Note: if mean <= 0.0 then always returns zero.
Instance methods operate on a user supplied uniform random number generator; they are unsynchronized.
Implementation: This is a port of RandPoisson used in CLHEP 1.4.0 (C++). CLHEP's implementation, in turn, is based upon "W.H.Press et al., Numerical Recipes in C, Second Edition".
| Field Summary | 
| Fields inherited from class cern.colt.PersistentObject | 
| serialVersionUID | 
| Constructor Summary | |
| PoissonSlow(double mean,
            RandomEngine randomGenerator)Constructs a poisson distribution. | |
| Method Summary | |
| static double | logGamma(double xx)Returns the value ln(Gamma(xx) for xx > 0. | 
|  int | nextInt()Returns a random number from the distribution. | 
|  void | setMean(double mean)Sets the mean. | 
| static int | staticNextInt(double mean)Returns a random number from the distribution with the given mean. | 
|  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 | 
public PoissonSlow(double mean,
                   RandomEngine randomGenerator)
| Method Detail | 
public static double logGamma(double xx)
public int nextInt()
nextInt in class AbstractDiscreteDistributionpublic void setMean(double mean)
public static int staticNextInt(double mean)
public String toString()
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