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Re: Philosophy of for loops [message #21564 is a reply to message #21521]

Wed, 30 August 2000 00:00

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

landsman@my-deja.com writes:
> (1) for j=0,2047 do for i=0,2047 do outarr[i,j] = median(inarr[*,i,j])
>
> (2) for j=0,2047 do begin
> for i=0,2047 do begin
> outarr[i,j] = median(inarr[*,i,j])
> endfor
> endfor
>
> Form (1) is slightly faster, but the calculation cannot be interrupted
> with a Control-C. Also, it is my impression that the speed difference
> is less than it used to be, and that form (2) is now better optimized.

I hadn't realized these were different! My choice between the two
forms usually revolves around stylistic concerns, i.e., does the thing
fit on the line. My guess is that form (2) is a little slower
*because* it is doing the keyboard checking. I have some roundabout
evidence that this is true.

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Philosophy of for loops By: tclement on Mon, 28 August 2000 00:00
		Re: Philosophy of for loops By: edward.s.meinel on Thu, 31 August 2000 06:40
		Re: Philosophy of for loops By: Craig Markwardt on Thu, 31 August 2000 08:51
		Re: Philosophy of for loops By: promashkin on Thu, 31 August 2000 08:46
		Re: Philosophy of for loops By: Craig Markwardt on Wed, 30 August 2000 00:00
		Re: Philosophy of for loops By: Struan Gray on Wed, 30 August 2000 00:00

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