Rupert Swarbrick wrote:
> Richard Fateman <fateman at cs.berkeley.edu> writes:
>
>> 4. if you need random size ffts and very fast, I have, quite by
>> coincidence, set up links between the FFTW package
>> and Lisp. This allows any size and may be 20X faster than Maxima's.
>> Downside: I've only debugged the
>> code for Allegro common lisp (free), and someone else will have to
>> duplicate the foreign-function interface
>> (about 1/2 page?) for any other lisp.
>> http://www.cs.berkeley.edu/~fateman/cheby/fftw.lisp
>>
>
> If you want to use any lisp other than Allegro, maybe it would be more
> sensible to use a binding based on a cross-platform FFI lib.
I agree. Unfortunately the other lisp I use, which is GCL (with Maxima)
apparently doesn't support such a thing.
> I notice
> that Kevin Rosenberg wrote one, which you can find at
> http://files.b9.com/cl-fftw3/.
I tried one by Cyrus Harmon, and was unsuccessful. I did not try this
one, which I believe is different.
> There's even a Debian package!
>
I try to get programs to run under Windows, since (last I looked), that
was the most common system,
and also the one I use.
But your point is generally correct. It is another reason for the
standard Windows version of Maxima to
move to some other lisp. I gather that there are still some important
issues that make this difficult.
(It would be even better if there were a revision of CL standard to
include such items as web /net /multiprocess/ ffi/ ...
which most have but not in the exactly same form.)
RJF