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Q: why is 2D-FFT incredibly slow in Mma3.0 ??

• To: mathgroup at smc.vnet.net
• Subject: [mg7031] Q: why is 2D-FFT incredibly slow in Mma3.0 ??
• From: wacb at aplcomm.jhuapl.edu (Bill Christens-Barry)
• Date: Fri, 2 May 1997 21:30:55 -0400 (EDT)
• Organization: Johns Hopkins Univ. Applied Physics Laboratory
• Sender: owner-wri-mathgroup at wolfram.com

I'm trying to do 2D Fast Fourier Transforms using Fourier[] in Mma v3.0
running on a 120MHz Macintosh.  My arrays are reals, 256 x 256.  Why does
this take ~ tens of seconds?

How can I speed things up?  Will compliation in Mma help?  Wolfram
techsupport says it won't.

Where can I see concrete examples or tutorials on the creation of
externals C code for compilation under CodeWarrior (v10 or v11) and that
are called by Mma?  I don't look forward to learning the down and dirty of
how to do this without some guidance?

Any help or suggestions most welcome.

Thanks.

Bill Christens-Barry