This class implements random variate generators having the Poisson distribution. More...
Inheritance diagram for PoissonGen:
Collaboration diagram for PoissonGen:
Public Member Functions | |
| PoissonGen (RandomStream s, double lambda) | |
Creates a Poisson random variate generator with parameter \(\lambda= \) lambda, using stream s. | |
| PoissonGen (RandomStream s, PoissonDist dist) | |
Creates a new random variate generator using the Poisson distribution dist and stream s. | |
| double | getLambda () |
| Returns the \(\lambda\) associated with this object. | |
 Public Member Functions inherited from RandomVariateGenInt | |
| RandomVariateGenInt (RandomStream s, DiscreteDistributionInt dist) | |
Creates a new random variate generator for the discrete distribution dist, using stream s. More... | |
| int | nextInt () |
| Generates a random number (an integer) from the discrete distribution contained in this object. More... | |
| void | nextArrayOfInt (int[] v, int start, int n) |
Generates n random numbers from the discrete distribution contained in this object. More... | |
| int [] | nextArrayOfInt (int n) |
Generates n random numbers from the discrete distribution contained in this object, and returns them in a new array of size n. More... | |
| DiscreteDistributionInt | getDistribution () |
| Returns the umontreal.ssj.probdist.DiscreteDistributionInt used by this generator. More... | |
| Public Member Functions inherited from RandomVariateGen | |
| RandomVariateGen (RandomStream s, Distribution dist) | |
Creates a new random variate generator from the distribution dist, using stream s. More... | |
| double | nextDouble () |
| Generates a random number from the continuous distribution contained in this object. More... | |
| void | nextArrayOfDouble (double[] v, int start, int n) |
Generates n random numbers from the continuous distribution contained in this object. More... | |
| double [] | nextArrayOfDouble (int n) |
Generates n random numbers from the continuous distribution contained in this object, and returns them in a new array of size n. More... | |
| RandomStream | getStream () |
| Returns the umontreal.ssj.rng.RandomStream used by this generator. More... | |
| void | setStream (RandomStream stream) |
Sets the umontreal.ssj.rng.RandomStream used by this generator to stream. | |
| Distribution | getDistribution () |
| Returns the umontreal.ssj.probdist.Distribution used by this generator. More... | |
| String | toString () |
Returns a String containing information about the current generator. | |
Static Public Member Functions | |
| static int | nextInt (RandomStream s, double lambda) |
A static method for generating a random variate from a Poisson distribution with parameter \(\lambda\) = lambda. | |
Protected Member Functions | |
| void | setParams (double lam) |
Sets the parameter \(\lambda= \) lam of this object. | |
Protected Attributes | |
| double | lambda |
| Protected Attributes inherited from RandomVariateGen | |
| RandomStream | stream |
| Distribution | dist |
Detailed Description
This class implements random variate generators having the Poisson distribution.
\[ p(x) = \frac{e^{-\lambda} \lambda^x}{x!} \qquad\mbox{for } x=0,1,…, \tag{fmass-Poisson} \]
where \(\lambda> 0\) is a real valued parameter equal to the mean.
No local copy of the parameter \(\lambda= \) lambda is maintained in this class. The (non-static) nextInt method simply calls inverseF on the distribution.
The documentation for this class was generated from the following file:
- PoissonGen.java
