com.numericalmethod.suanshu.stats.random.multivariate
Class Multinomial

java.lang.Object
  com.numericalmethod.suanshu.stats.random.multivariate.Multinomial

All Implemented Interfaces:

RandomVectorGenerator

public class Multinomial
extends java.lang.Object
implements RandomVectorGenerator

This class generate random vectors from a multinomial distribution.

The R equivalent function is rmultinom in package normix.

Constructor Summary

Multinomial(int size, double[] prob)
Construct a Multinomial random vector generator.

Multinomial(int size, double[] prob, RandomNumberGenerator rng)
Construct a Multinomial random vector generator.

Method Summary

double[]	nextVector() Get the next random vector.
void	seed(long... seeds) Seed the random number generator to produce repeatable sequences.

Methods inherited from class java.lang.Object

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

Constructor Detail

Multinomial

public Multinomial(int size,
                   double[] prob,
                   RandomNumberGenerator rng)

Construct a Multinomial random vector generator.

Parameters:

size - integer, say N, specifying the total number of objects that are put into K boxes in the typical multinomial experiment

prob - numeric non-negative vector of length K, specifying the probability for the K classes; is internally normalized to sum 1

rng - a uniform random number generator

Multinomial

public Multinomial(int size,
                   double[] prob)

Construct a Multinomial random vector generator.

Parameters:

size - integer, say N, specifying the total number of objects that are put into K boxes in the typical multinomial experiment

prob - numeric non-negative vector of length K, specifying the probability for the K classes; is internally normalized to sum 1

Method Detail

seed

public void seed(long... seeds)

Description copied from interface: RandomVectorGenerator

Seed the random number generator to produce repeatable sequences.

Specified by:

seed in interface RandomVectorGenerator

Parameters:

seeds - the seeds

nextVector

public double[] nextVector()

Description copied from interface: RandomVectorGenerator

Get the next random vector.

Specified by:

nextVector in interface RandomVectorGenerator

Returns:

the next random vector