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Re: My code is way to slow.. How can I optimize!? [message #46578 is a reply to message #46577]

Mon, 28 November 2005 15:27

leatherback
Messages: 15
Registered: November 2005

Junior Member

Hi David,

Thanks for your reply. Nope, i do not have money burning a hole in my
pocket. It is more that I know that the flowchart of the actual routine
I am using will be published in a remote sensing journal soon anyway
(Also already available online as chapter 6 in
http://www.itc.nl/library/Papers_2005/phd/ferwerda.pdf). So I do not
really care about people getting the code I used, It has served my
purpose, and I am now applying it to a dataset, where not this code,
but the data it will be processing is crucial.

Anyway. It basically is a series of nested routines, within which I
perform regressions on subsets, and generate statistics of these
regressions. Since about 300 lines of the code fall within these loops,
i am not particularly sure which parts take most of the time. It
probably is part of an array concenation part, which in a normal
dataset is performed about 500,000 times. But it could also be the
regression which is also performed about 500,000 times.

I am convinced that my code is sub-sub-sub optimal. Just do not know
where to start optimizing it, as I am not a programmer, but a mere
ecologist :-(

J.

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[Message index]

		Re: My code is way to slow.. How can I optimize!? By: leatherback on Mon, 28 November 2005 16:29
		Re: My code is way to slow.. How can I optimize!? By: Mark Hadfield on Mon, 28 November 2005 15:57
		Re: My code is way to slow.. How can I optimize!? By: Rick Towler on Mon, 28 November 2005 15:43
		Re: My code is way to slow.. How can I optimize!? By: David Fanning on Mon, 28 November 2005 15:42
		Re: My code is way to slow.. How can I optimize!? By: leatherback on Mon, 28 November 2005 15:27
		Re: My code is way to slow.. How can I optimize!? By: David Fanning on Mon, 28 November 2005 15:00

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