sim.util.distribution
Class Hyperbolic

java.lang.Object
  sim.util.distribution.AbstractDistribution
      sim.util.distribution.AbstractContinousDistribution
          sim.util.distribution.Hyperbolic

All Implemented Interfaces:

java.io.Serializable

public class Hyperbolic
extends AbstractContinousDistribution

Hyperbolic distribution.

Valid parameter ranges: alpha > 0 and beta > 0.

Instance methods operate on a user supplied uniform random number generator; they are unsynchronized.

Static methods operate on a default uniform random number generator; they are synchronized.

Implementation:

Method: Non-Universal Rejection. High performance implementation.

This is a port of hyplc.c from the C-RAND / WIN-RAND library. C-RAND's implementation, in turn, is based upon

L. Devroye (1986): Non-Uniform Random Variate Generation, Springer Verlag, New York.

See Also:

Serialized Form

Field Summary

protected double	a_setup
protected double	alpha
protected double	b_setup
protected double	beta
protected double	e
protected double	hl
protected double	hr
protected double	mmb_1
protected double	mpa_1
protected double	pm
protected double	pmr
protected double	pr
protected double	s
protected double	samb
protected double	u
protected double	v
protected double	x

Fields inherited from class sim.util.distribution.AbstractDistribution

randomGenerator

Constructor Summary

Hyperbolic(double alpha, double beta, MersenneTwisterFast randomGenerator)
Constructs a Beta distribution.

Method Summary

double	nextDouble() Returns a random number from the distribution.
double	nextDouble(double alpha, double beta) Returns a hyperbolic distributed random number; bypasses the internal state.
void	setState(double alpha, double beta) Sets the parameters.
java.lang.String	toString() Returns a String representation of the receiver.

Methods inherited from class sim.util.distribution.AbstractDistribution

apply, apply, getRandomGenerator, nextInt, setRandomGenerator

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

alpha

protected double alpha

beta

protected double beta

a_setup

protected double a_setup

b_setup

protected double b_setup

x

protected double x

u

protected double u

v

protected double v

e

protected double e

hr

protected double hr

hl

protected double hl

s

protected double s

pm

protected double pm

pr

protected double pr

samb

protected double samb

pmr

protected double pmr

mpa_1

protected double mpa_1

mmb_1

protected double mmb_1

Constructor Detail

Hyperbolic

public Hyperbolic(double alpha,
                  double beta,
                  MersenneTwisterFast randomGenerator)

Constructs a Beta distribution.

Method Detail

nextDouble

public double nextDouble()

Returns a random number from the distribution.

Specified by:

nextDouble in class AbstractDistribution

nextDouble

public double nextDouble(double alpha,
                         double beta)

Returns a hyperbolic distributed random number; bypasses the internal state.

setState

public void setState(double alpha,
                     double beta)

Sets the parameters.

toString

public java.lang.String toString()

Returns a String representation of the receiver.

Overrides:

toString in class java.lang.Object