This class implements random variate generators having the Poisson distribution. More...
Public Member Functions | |
| PoissonGen (RandomStream s, double lambda) | |
| Creates a Poisson random variate generator with parameter. | |
| 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 umontreal.ssj.randvar.RandomVariateGenInt | |
| RandomVariateGenInt (RandomStream s, DiscreteDistributionInt dist) | |
| Creates a new random variate generator for the discrete distribution dist, using stream s. | |
| int | nextInt () |
| Generates a random number (an integer) from the discrete distribution contained in this object. | |
| void | nextArrayOfInt (int[] v, int start, int n) |
| Generates n random numbers from the discrete distribution contained in this object. | |
| 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. | |
| DiscreteDistributionInt | getDistribution () |
| Returns the umontreal.ssj.probdist.DiscreteDistributionInt used by this generator. | |
| Public Member Functions inherited from umontreal.ssj.randvar.RandomVariateGen | |
| RandomVariateGen (RandomStream s, Distribution dist) | |
| Creates a new random variate generator from the distribution dist, using stream s. | |
| double | nextDouble () |
| Generates a random number from the continuous distribution contained in this object. | |
| void | nextArrayOfDouble (double[] v, int start, int n) |
| Generates n random numbers from the continuous distribution contained in this object. | |
| 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. | |
| RandomStream | getStream () |
| Returns the umontreal.ssj.rng.RandomStream used by this generator. | |
| void | setStream (RandomStream stream) |
| Sets the umontreal.ssj.rng.RandomStream used by this generator to stream. | |
| 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. | |
Detailed Description
This class implements random variate generators having the Poisson distribution.
Its mass function is
\[ p(x) = \frac{e^{-\lambda} \lambda^x}{x!} \qquad\mbox{for } x=0,1,…, \tag{fmass-Poisson} \]
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.
Definition at line 46 of file PoissonGen.java.
Constructor & Destructor Documentation
◆ PoissonGen() [1/2]
| umontreal.ssj.randvar.PoissonGen.PoissonGen | ( | RandomStream | s, |
| double | lambda ) |
Creates a Poisson random variate generator with parameter.
\(\lambda= \) lambda, using stream s.
Definition at line 54 of file PoissonGen.java.
◆ PoissonGen() [2/2]
| umontreal.ssj.randvar.PoissonGen.PoissonGen | ( | RandomStream | s, |
| PoissonDist | dist ) |
Creates a new random variate generator using the Poisson distribution dist and stream s.
Definition at line 63 of file PoissonGen.java.
Member Function Documentation
◆ getLambda()
| double umontreal.ssj.randvar.PoissonGen.getLambda | ( | ) |
Returns the \(\lambda\) associated with this object.
Definition at line 80 of file PoissonGen.java.
◆ nextInt()
|
static |
A static method for generating a random variate from a Poisson distribution with parameter \(\lambda\) = lambda.
Reimplemented in umontreal.ssj.randvar.PoissonTIACGen.
Definition at line 73 of file PoissonGen.java.
◆ setParams()
|
protected |
Sets the parameter \(\lambda= \) lam of this object.
Definition at line 87 of file PoissonGen.java.
The documentation for this class was generated from the following file:
- src/main/java/umontreal/ssj/randvar/PoissonGen.java
