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2D FFT Slow. Any ideas? [message #37257]

Fri, 05 December 2003 00:57

Brian
Messages: 27
Registered: March 2001

Junior Member

I did a little benchmark between IDL and MATLAB. In each case I created a
random double precision complex array of size 2048 by 2048 and timed how
long the 2D FFT took. In MATLAB 6.5 it took about 3.5 sec, and in IDL, it
took about 10 sec. Is there a way to have IDL use MATLAB for the FFT,
perhaps using activex? Or would the overhead in using activex defeat the
purpose?

thanks,

brian

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Re: 2D FFT Slow. Any ideas? [message #37365 is a reply to message #37257]

Mon, 08 December 2003 13:02

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

Hey, came across this message,
http://www.mathworks.com/company/newsletter/clevescorner/win ter01_cleve.shtml
seems matlab 6 incorporates fftw.
Perhaps that explains the difference in time between idl and matlab

Note: if anyone wants a windows binary of fftw (dll), it is available from
the
fftw website. http://www.fftw.org/

Cheers,
bob

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