The Dirichlet Distribution
Density function and random generation from the Dirichlet distribution.
ddirichlet(x, alpha) rdirichlet(n, alpha)
x |
A vector containing a single deviate or matrix containing one random deviate per row. |
alpha |
Vector of shape parameters, or matrix of shape parameters corresponding to the number of draw. |
n |
Number of random vectors to generate. |
The Dirichlet distribution is the multidimensional generalization of the beta distribution.
ddirichlet gives the density. rdirichlet returns a
matrix with n rows, each containing a single Dirichlet random
deviate.
Code is taken from Greg's Miscellaneous Functions (gregmisc). His code was based on code posted by Ben Bolker to R-News on 15 Dec 2000.
density <- ddirichlet(c(.1,.2,.7), c(1,1,1)) draws <- rdirichlet(20, c(1,1,1) )
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