umontreal.iro.lecuyer.randvar
Class ExponentialGen

java.lang.Object
  umontreal.iro.lecuyer.randvar.RandomVariateGen
      umontreal.iro.lecuyer.randvar.ExponentialGen

Direct Known Subclasses:

ExponentialInverseFromDensityGen

public class ExponentialGen
extends RandomVariateGen

This class implements random variate generators for the exponential distribution. The density is

f (x) = λe^-λx for x >= 0,

where λ > 0.

The (non-static) nextDouble method simply calls inverseF on the distribution.

Constructor Summary

ExponentialGen(RandomStream s, double lambda)
Creates an exponential random variate generator with parameter λ = lambda, using stream s.

ExponentialGen(RandomStream s, ExponentialDist dist)
Creates a new generator for the exponential distribution dist and stream s.

Method Summary

double	getLambda() Returns the λ associated with this object.
static double	nextDouble(RandomStream s, double lambda) Uses inversion to generate a new exponential variate with parameter λ = lambda, using stream s.

Methods inherited from class umontreal.iro.lecuyer.randvar.RandomVariateGen

getDistribution, getStream, nextArrayOfDouble, nextDouble, setStream, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ExponentialGen

public ExponentialGen(RandomStream s,
                      double lambda)

Creates an exponential random variate generator with parameter λ = lambda, using stream s.

ExponentialGen

public ExponentialGen(RandomStream s,
                      ExponentialDist dist)

Creates a new generator for the exponential distribution dist and stream s.

Method Detail

nextDouble

public static double nextDouble(RandomStream s,
                                double lambda)

Uses inversion to generate a new exponential variate with parameter λ = lambda, using stream s.

getLambda

public double getLambda()

Returns the λ associated with this object.