Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
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