umontreal.iro.lecuyer.randvar
Class PowerGen

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

public class PowerGen
extends RandomVariateGen

This class implements random variate generators for the power distribution with shape parameter c > 0, over the interval [a, b]. Its density is

f (x) = c(x - a)^c-1/(b - a)^c

for a <= x <= b, and 0 elsewhere.

Constructor Summary

PowerGen(RandomStream s, double c)
Creates a Power random variate generator with parameters a = 0, b = 1 and c = c, using stream s.

PowerGen(RandomStream s, double a, double b, double c)
Creates a Power random variate generator with parameters a = a, b = b and c = c, using stream s.

PowerGen(RandomStream s, PowerDist dist)
Creates a new generator for the power distribution dist and stream s.

Method Summary

double	getA() Returns the parameter a.
double	getB() Returns the parameter b.
double	getC() Returns the parameter c.
static double	nextDouble(RandomStream s, double a, double b, double c) Uses inversion to generate a new variate from the power distribution with parameters a = a, b = b, and c = c, using stream s.
void	setParams(double a, double b, double c) Sets the parameters a, b and c for this object.

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

PowerGen

public PowerGen(RandomStream s,
                double a,
                double b,
                double c)

Creates a Power random variate generator with parameters a = a, b = b and c = c, using stream s.

PowerGen

public PowerGen(RandomStream s,
                double c)

Creates a Power random variate generator with parameters a = 0, b = 1 and c = c, using stream s.

PowerGen

public PowerGen(RandomStream s,
                PowerDist dist)

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

Method Detail

nextDouble

public static double nextDouble(RandomStream s,
                                double a,
                                double b,
                                double c)

Uses inversion to generate a new variate from the power distribution with parameters a = a, b = b, and c = c, using stream s.

getA

public double getA()

Returns the parameter a.

getB

public double getB()

Returns the parameter b.

getC

public double getC()

Returns the parameter c.

setParams

public void setParams(double a,
                      double b,
                      double c)

Sets the parameters a, b and c for this object.