number of points to generate (i.e. in a matrix with elements as rows.
dim
number of variables to generate.
span
[-span, span] is used as bounds to uniform sampling for all variables.
mindist
minimal distance that each element should have with all others. the "control" C routine is used to perform this verification. All points that do not respect this constraint are resampled.
maxit
maximal number of iterations before current elements are returned.