On Thu, Jul 20, 2006 at 04:48:14PM -0500, Chuck Cole wrote: > Isn't a simple ratio approximation similar to the one 355/113 about > that good ? That particular one is good to about 1 part per ten > million (about 7 places) and is much faster in hardware !! I generally prefer 4 * atan2(1,1). Less to remember.... :-) -- trammell at el-swifto.com 9EC7 BC6D E688 A184 9F58 FD4C 2C12 CC14 8ABA 36F5 Twin Cities Linux Users Group (TCLUG) Minneapolis/St. Paul, Minnesota