vec2mat: Auxiliary function, produces matrix from vector
Description
The number of elements of vec are the number of non-zero elements in the
adjacency matrix.
It performs the opposite operation of `mat2vec.ix`.
Usage
vec2mat(vec, directed, selfloops, n)
Arguments
vec
vector to be put in matrix form
directed
a boolean argument specifying whether object is directed or not.
selfloops
a boolean argument specifying whether the model should
incorporate selfloops.
n
vector. if length(n)==1, n is the number of vertices. If length(n)==3
first element is number of vertices, second and third elements are number of
vertices for row and column of bipartite matrix.