On Tue, Jul 17, 2012 at 5:12 AM, Bo Jacoby <bojacoby at yahoo.dk> wrote: > Yes, the roots-of-unity verb rou from the Essay/FFT is only to be used for computing this fft. Ok... but I do not see any really good reasons for pushing that -: into the definition of rou. You can just as easily use rou at -: -- Raul