FFT Lib?

[Mike James]

"dsimcha" <dsimcha at yahoo.com> wrote in message 
news:i2na5q$2kgi$1 at digitalmars.com...
> I'm going to need an FFT library to perform some convolutions at some 
> point
> soon.  Two absolute, non-negotiable requirements are that it be written in
> pure D and that it be Boost or compatibly (i.e. zlib or public domain)
> licensed.  I also prefer "simple and good enough" over "has every
> micro-optimization in the book but a PITA to maintain/modify/use", as long 
> as
> it's at least a true fft as opposed to an O(N^2) DFT.  A few questions:
>
> 1.  Does anyone already have such a lib?
>
> 2.  If noone has one I'll probably either write my own from scratch  or 
> port
> some code from C if I can find code that's under a suitable license and
> written with a "simple and good enough" philosophy rather than an "every 
> tiny
> optimization in the book" philosophy.  Could anyone recommend one to port?
>
> 3.  If I do end up writing my own or porting, is there sufficient interest 
> in
> this that I should try to target it for std.numerics, or would I be better 
> off
> just making it good enough for my use case?

This is one of the best FFTs I've used...

http://www.fftw.org/

I don't know whether the licence is ok for you.

-=mike=-