edu.rit.numeric

Class BernoulliPrng

java.lang.Object

edu.rit.numeric.BernoulliPrng

public class BernoulliPrng
extends java.lang.Object

Class BernoulliPrng provides a pseudorandom number generator (PRNG) that generates random values of type boolean. The probability of the value true (heads) is p, specified to the constructor. The probability of the value false (tails) is q = 1 − p.

Constructor Summary

Constructors

Constructor and Description
BernoulliPrng(Random theUniformPrng) Construct a new Bernoulli PRNG with heads probability = 0.5.
BernoulliPrng(Random theUniformPrng, double p) Construct a new Bernoulli PRNG with the given heads probability.

Method Summary

Modifier and Type	Method and Description
boolean	next() Returns the next random value.

Methods inherited from class java.lang.Object

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

Constructor Detail

BernoulliPrng

public BernoulliPrng(Random theUniformPrng)

Construct a new Bernoulli PRNG with heads probability = 0.5.

Parameters:

theUniformPrng - The underlying uniform PRNG.

Throws:

java.lang.NullPointerException - (unchecked exception) Thrown if theUniformPrng is null.

BernoulliPrng

public BernoulliPrng(Random theUniformPrng,
                     double p)

Construct a new Bernoulli PRNG with the given heads probability.

Parameters:

theUniformPrng - The underlying uniform PRNG.

p - Heads probability, 0 ≤ p ≤ 1.

Throws:

java.lang.NullPointerException - (unchecked exception) Thrown if theUniformPrng is null.

java.lang.IllegalArgumentException - (unchecked exception) Thrown if p < 0 or p > 1.

Method Detail

next

public boolean next()

Returns the next random value. True (heads) is returned with probability p, false (tails) is returned with probability 1 − p.

Returns:

Random value.