I can get an exact answer to the shape of a parabola, and darn good approximations to the shapes of cubics and quartics. :-D ------ STL137@aol.com ===> Website: http://members.aol.com/stl137/ PGP keys: ~~~pgp.html Quotes: ~~~quotes.html "I have sworn upon the altar of God eternal hostility against every form of tyranny over the mind of man" - Thomas Jefferson