

   AAcccceessss ttoo tthhee FFoorrmmaall AArrgguummeennttss

        formals(fun=sys.function(sys.parent()))

   VVaalluuee::

        If `fun' is a function then the formal argument list to
        that function is returned.  If `fun' is a character
        string then the function with that name is found and
        used.  If `fun' is not specified then the function
        calling `formals' is used.

        It is currently not possible to set the formals of a
        function.

   SSeeee AAllssoo::

        `args'

   EExxaammpplleess::

        length(formals(lm))      # the number of formal arguments
        names(formals(boxplot))  # formal arguments names

