On Fri, Jul 27, 2001 at 05:12:03AM +0200, Steffen Persvold wrote: > Now, any idea why dfftpack needs the workspace to be 4 > *n+15 and SGI libraries only n+15 ?? Different algorithms precompute different things and do different things with their working storage. With libraries like FFTW you don't even know what algorithm to use in advance. g