general prime factor algorithm (gpfa) FFT code in FORTRAN. ---- begin quote ---- Well, you might be interested in the Generalized Prime Factor FFT routines based on Clive Temperton's GPFA algorithm. I have tried out these routines and they are the fastest I have benchmarked, in many cases faster than supercomputer manufacturers assembly coded and tuned machine-dependant ones. (This is because of the superior algorithms used). They are in FORTRAN, but there's always f2c. URL is ftp://ftp.earth.ox.ac.uk/pub/gpfa.tar.Z ---- end quote ---- Didn't see it, please don't ask questions about it ! Send me your C-translation of this code. joerg arndt arndt (AT) jjj.de http://www.jjj.de/