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Re: Philosophy of for loops [message #21613 is a reply to message #21529]

Thu, 31 August 2000 08:51

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

edward.s.meinel@aero.org writes:
>
> So does that mean that form (3) is slower than form (1)?
>
> (3) for j=0,2047 do $
> for i=0,2047 do $
> outarr[i,j]=median(inarr[*,i,j])
>

No, I think your form (3) would be interpretted as a single line, so
it would be equivalent to form (2). The following form (4) would be
slightly slower than (1), but keep in mind that small amounts of
processing in the outer loop are pretty much negligible.

for j = 0, 2047 do begin
for i = 0, 2047 do begin
outarr[i,j]=median(inarr[*,i,j])
endfor
endfor

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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