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Re: call external speed [message #12817 is a reply to message #12686]

Tue, 08 September 1998 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

curtis volin wrote:
>
> I use the IDL SVD command very frequently, so I was wondering if it would
> be any faster to create a DLL and call it with call external. I suppose
> that the fundamental question is, are IDL routines optimized for speed?
>

Curtis -

Once I had to write a specialized interpolation algorithm, so I coded
it in C and called it using CALL_EXTERNAL. I made my routine as general
as I could, so performing the standard interpolation would be an
option. Just for kicks, I decided to compare the speed of my
routine and IDL's INTERPOLATE() routine. The results were *very*
similar. I would say that it is fairly safe to say that IDL's
routines are well optimized.

Dave
--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

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[Message index]

		call external speed By: curtis volin on Wed, 02 September 1998 00:00
		Re: call external speed By: steinhh on Fri, 04 September 1998 00:00
		Re: call external speed By: rmlongfield on Fri, 04 September 1998 00:00
		Re: call external speed By: Karl Krieger on Thu, 03 September 1998 00:00
		Re: call external speed By: David Foster on Tue, 08 September 1998 00:00
		Re: call external speed By: Karl Krieger on Mon, 14 September 1998 00:00

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