umontreal.iro.lecuyer.randvar

Class ExponentialGen

java.lang.Object

umontreal.iro.lecuyer.randvar.RandomVariateGen

umontreal.iro.lecuyer.randvar.ExponentialGen

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

Constructors

Constructor and Description
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

Methods

Modifier and Type	Method and Description
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

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, 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.