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FFT on a huge array [message #28915]

Wed, 16 January 2002 12:52

Luca Bertello
Messages: 1
Registered: January 2002

Junior Member

Dear all,

I have a huge file containing a 3-D array (series of images) and I have
to perform a
FFT on this array. Unfortunately, due to the limited resources of my
system,
I cannot simply allocate the full array (say
a=fltarr(npt_x,npt_y,npt_t)) in memory and then
calculate FFT(a). Does anyone know an efficient way to solve this
problem on
IDL? A 3-D FFT can of course be computed either as three 1-D FFTs or
a 2-D FFT and 1-D FFT, but I'm having some trouble with the I/O. Please
forward
you answers to my email address as well, since I don't have to many
opportunities to
read this newsgroup.

Thanks in advance,

Luca

Luca Bertello
bertello@astro.ucla.edu

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