Hello, Common lisp's atan2 is atan called with the optional arg To implement atan2 in math.lisp is trivial: (defun |atan2| (y x) (atan (conv y) (conv x))) _______________________________________________ cinline-announce mailing list cinline-announce@common-lisp.net http://common-lisp.net/cgi-bin/mailman/listinfo/cinline-announce