Graph generation based on different vertex types

establishment.game() was renamed to sample_traits() to create a more consistent API.

Usage

establishment.game(
  nodes,
  types,
  k = 1,
  type.dist = rep(1, types),
  pref.matrix = matrix(1, types, types),
  directed = FALSE
)

nodes: The number of vertices in the graph.
types: The number of different vertex types.
k: The number of trials per time step, see details below.
type.dist: The distribution of the vertex types. This is assumed to be stationary in time.
pref.matrix: A matrix giving the preferences of the given vertex types. These should be probabilities, i.e. numbers between zero and one.
directed: Logical constant, whether to generate directed graphs.