umontreal.iro.lecuyer.randvar
Class NormalPolarGen

java.lang.Object
  umontreal.iro.lecuyer.randvar.RandomVariateGen
      umontreal.iro.lecuyer.randvar.NormalGen
          umontreal.iro.lecuyer.randvar.NormalPolarGen

public class NormalPolarGen
extends NormalGen

This class implements normal random variate generators using the polar method with rejection. Since the method generates two variates at a time, the second variate is returned upon the next call to nextDouble.

Constructor Summary

NormalPolarGen(RandomStream s)
Creates a standard normal random variate generator with μ = 0 and σ = 1, using stream s.

NormalPolarGen(RandomStream s, double mu, double sigma)
Creates a normal random variate generator with mean mu and standard deviation sigma, using stream s.

NormalPolarGen(RandomStream s, NormalDist dist)
Creates a random variate generator for the normal distribution dist and stream s.

Method Summary

double	nextDouble() Generates a random number from the continuous distribution contained in this object.
static double	nextDouble(RandomStream s, double mu, double sigma)

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

getMu, getSigma

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

getDistribution, getStream, nextArrayOfDouble, setStream, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

NormalPolarGen

public NormalPolarGen(RandomStream s,
                      double mu,
                      double sigma)

Creates a normal random variate generator with mean mu and standard deviation sigma, using stream s.

NormalPolarGen

public NormalPolarGen(RandomStream s)

Creates a standard normal random variate generator with μ = 0 and σ = 1, using stream s.

NormalPolarGen

public NormalPolarGen(RandomStream s,
                      NormalDist dist)

Creates a random variate generator for the normal distribution dist and stream s.

Method Detail

nextDouble

public double nextDouble()

Description copied from class: RandomVariateGen

Generates a random number from the continuous distribution contained in this object. By default, this method uses inversion by calling the inverseF method of the distribution object. Alternative generating methods are provided in subclasses.

Overrides:

nextDouble in class RandomVariateGen

Returns:

the generated value

nextDouble

public static double nextDouble(RandomStream s,
                                double mu,
                                double sigma)