I don't know the maximum but if you pick something with a smaller number of prime factors, you should be able to do a larger FFT (within your memory and pdl size limits).
You could try PDL::FFTW but you will need to install version 2 of the FFTW library. --Chris On Wed, Feb 13, 2013 at 3:35 AM, Frank Boers <[email protected]> wrote: > Dear PDLs, > what is the maximum number of elements PDL::FFT can process? > > use PDL::FFT > > $data=random(8000000) > > realfft($data) > > $data=random(8100000) > > realfft($data) > Error: fftradix() - exceeded number of factors > Error: fftradix() - insufficient memory. > > > best regards > Frank > > -- > Frank Boers > Institute of Neuroscience and Medicine - 4 > Medical Imaging Physics > Forschungszentrum Juelich GmbH > 52425 Juelich > phone: +49 - (0)2461-61-6005 > fax : +49 - (0)2461-61-2820 > email: [email protected] > http://www.fz-juelich.de/inm/inm-4/DE/Forschung/MEG-Physik/_node.html > > > > ------------------------------------------------------------------------------------------------ > ------------------------------------------------------------------------------------------------ > Forschungszentrum Juelich GmbH > 52425 Juelich > Sitz der Gesellschaft: Juelich > Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 > Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher > Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), > Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, > Prof. Dr. Sebastian M. Schmidt > ------------------------------------------------------------------------------------------------ > ------------------------------------------------------------------------------------------------ > > _______________________________________________ > Perldl mailing list > [email protected] > http://mailman.jach.hawaii.edu/mailman/listinfo/perldl _______________________________________________ Perldl mailing list [email protected] http://mailman.jach.hawaii.edu/mailman/listinfo/perldl
