Dirichlet {DIRECT} R Documentation

## The Dirichlet Distribution

### Description

Functions to compute the density of a Dirichlet distribution and to generate random realizations from such a distribution.

### Usage

dDirichlet (x, alpha, log=FALSE)
rDirichlet (n, alpha)


### Arguments

 alpha Shape parameter vector. x Vector of the same length as alpha. n Number of realizations (vectors) to generate. log Logical value. TRUE if computing the log density. Default is FALSE.

### Value

rDirichlet returns a vector of the same length as alpha if n=1, or a matrix with each row being an independent realization otherwise.

### Author(s)

Audrey Q. Fu coded dDirichlet.

The code for rDirichlet is taken from a similar function in R package gregmisc by Gregory R. Warnes. His code was based on code posted by Ben Bolker to R-News on 15 Dec 2000. See documentation in gregmisc for further information.

### Examples

x <- rDirichlet (5, rep (0.5, 3))
dDirichlet (x[1, ], rep (0.5, 3))


[Package DIRECT version 1.0.1 Index]