[R] FFTW (Was: [R] Does R use the ATLAS linear algebra library?)

Jason Turner jasont at indigoindustrial.co.nz
Sat May 5 17:53:57 CEST 2001

> I'm
> also going to test out FFTW from http://www.fftw.org/; it looks good on
> paper, and if there are FFTs in R, it might be worth looking at.

FFTW is quite good.  Haven't got my benchmarks handy, but it is a 
noticible speedup, and it doesn't zero-pad.  The most obvious result
of not zero-padding is on the extreme frequencies (close to 0 or 0.5 
times the sampling frequency).  However, I believe the setup for 
comutation is different enough from what R uses internally that 
you'd have to set up another fft() and mvfft(), and load that in 
a library higher on the search path than "base".  Anyone done this, 
or something like it?


Indigo Industrial Controls Ltd.
jasont at indigoindustrial.co.nz
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