umontreal.iro.lecuyer.randvar

Class TriangularGen

java.lang.Object

umontreal.iro.lecuyer.randvar.RandomVariateGen

umontreal.iro.lecuyer.randvar.TriangularGen

public class TriangularGen
extends RandomVariateGen

This class implements random variate generators for the triangular distribution. Its density is

f (x) =	2(x - a)/[(b - a)(m - a)]	for a <= x <= m,
f (x) =	2(b - x)/[(b - a)(b - m)]	for m <= x <= b,
f (x) =	0	elsewhere,

where a <= m <= b (see, e.g.,).

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

Constructor Summary

Constructors

Constructor and Description
TriangularGen(RandomStream s, double m) Creates a triangular random variate generator over the interval (0, 1), with parameter m, using stream s.
TriangularGen(RandomStream s, double a, double b, double m) Creates a triangular random variate generator over the interval (a, b), with parameter m, using stream s.
TriangularGen(RandomStream s, TriangularDist dist) Creates a new generator for the triangular distribution dist and stream s.

Method Summary

Modifier and Type	Method and Description
double	getA() Returns the value of a for this object.
double	getB() Returns the value of b for this object.
double	getM() Returns the value of m for this object.
static double	nextDouble(RandomStream s, double a, double b, double m) Generates a new variate from the triangular distribution with parameters a = a, b = b and m = m and stream s, using inversion.

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

TriangularGen

public TriangularGen(RandomStream s,
                     double a,
                     double b,
                     double m)

Creates a triangular random variate generator over the interval (a, b), with parameter m, using stream s.

TriangularGen

public TriangularGen(RandomStream s,
                     double m)

Creates a triangular random variate generator over the interval (0, 1), with parameter m, using stream s.

TriangularGen

public TriangularGen(RandomStream s,
                     TriangularDist dist)

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

Method Detail

nextDouble

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

Generates a new variate from the triangular distribution with parameters a = a, b = b and m = m and stream s, using inversion.

getA

public double getA()

Returns the value of a for this object.

getB

public double getB()

Returns the value of b for this object.

getM

public double getM()

Returns the value of m for this object.