com.numericalmethod.suanshu.stats.random.multivariate

Class MultinomialRvg

java.lang.Object

com.numericalmethod.suanshu.stats.random.multivariate.MultinomialRvg

All Implemented Interfaces:

RandomVectorGenerator, java.io.Serializable

public class MultinomialRvg
extends java.lang.Object
implements RandomVectorGenerator

A multinomial distribution puts N objects into K bins according to the bins' probabilities. An output random vector counts the number of objects in each bin, making a total of N.

The R equivalent function is rmultinom in package normix.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
MultinomialRvg(int size, double[] prob) Construct a multinomial random vector generator.
MultinomialRvg(int size, double[] prob, RandomLongGenerator rng) Construct a multinomial random vector generator.

Method Summary

Modifier and Type	Method and Description
double[]	nextVector() Get the next random vector.
void	seed(long... seeds) Seed the random vector 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

MultinomialRvg

public MultinomialRvg(int size,
                      double[] prob,
                      RandomLongGenerator rng)

Construct a multinomial random vector generator.

Parameters:

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

prob - a numeric non-negative vector of length K, specifying the probability for the K boxes

rng - a uniform random number generator

MultinomialRvg

public MultinomialRvg(int size,
                      double[] prob)

Construct a multinomial random vector generator.

Parameters:

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

prob - a numeric non-negative vector of length K, specifying the probability for the K boxes

Method Detail

seed

public void seed(long... seeds)

Description copied from interface: RandomVectorGenerator

Seed the random vector 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