vecfun_names
are intended for use inside the node formulas.
Adding functions to this list will generally greatly expedite the simulation run time.
Any node formula calling a function on this list will be evaluated "as is", the function should
be written to accept arguments as either vectors of length n
or as matrices with n
rows.
Adding function to this list will effects simulation from all DAG objects that call this function. See vignette for more details.vecfun.add(vecfun_names)