R igraph manual pages

sample_dirichlet {igraph}

R Documentation

Sample from a Dirichlet distribution

Description

Sample finite-dimensional vectors to use as latent position vectors in random dot product graphs

Usage

sample_dirichlet(n, alpha)

Arguments

n	Integer scalar, the sample size.
alpha	Numeric vector, the vector of \alpha parameter for the Dirichlet distribution.

Details

sample_dirichlet generates samples from the Dirichlet distribution with given \alpha parameter. The sample is drawn from length(alpha)-1-simplex.

Value

A dim (length of the alpha vector for sample_dirichlet) times n matrix, whose columns are the sample vectors.

See Also

Other latent position vector samplers: sample_sphere_surface(), sample_sphere_volume()

Examples

lpvs.dir    <- sample_dirichlet(n=20, alpha=rep(1, 10))
RDP.graph.2 <- sample_dot_product(lpvs.dir)
colSums(lpvs.dir)

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