Yes it has. The main thing is that it has accelerators for 6 and 7 as factors - the old accelerators stopped at 5. 8192 doesn't have either of those factors (since it is a power of 2). But, there may have been bug fixes that I don't remember. I will zip up the latest code and send them to you this afternoon. <div class="gmail_quote">On Tue, Oct 19, 2010 at 9:15 AM, John Clements <<a href="mailto:clements@brinckerhoff.org" target="_blank">clements@brinckerhoff.org</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div> On Oct 19, 2010, at 5:17 AM, Doug Williams wrote: > On my laptop: > > #lang racket > > (require "fft.rkt") > > (define v (build-vector 16384 (lambda (i) (random)))) > > (define v1 (vector-copy v)) > > (collect-garbage) > (collect-garbage) > (collect-garbage) > (time (fft-complex-radix2-forward v1)) > > (define v2 (vector-copy v)) > > (collect-garbage) > (collect-garbage) > (collect-garbage) > (time (fft-complex-forward v2)) > > (for/and ([i (in-range (vector-length v))]) > (< (magnitude (- (vector-ref v1 i) (vector-ref v2 i))) 1e-4)) > > ==> > > cpu time: 94 real time: 94 gc time: 0 > cpu time: 79 real time: 78 gc time: 0 > #t > > I'll look at the rsound/fft implementation and see if I see the problem. </div>It certainly sounds as though I broke it, or it changed after I got it. Has the source changed since you sent it to me last year? John </blockquote></div>