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Re: Philosophy of for loops [message #21510 is a reply to message #21486]

Mon, 28 August 2000 23:43

marc schellens[1]
Messages: 183
Registered: January 2000

Senior Member

Todd Clements wrote:
>
> Hello, again, everyone!
>
> I was just wondering what the general concensus of the "IDL Expert
> Programmers" was on the use of for loops. When I first learned IDL, I
> remember getting from someone or somewhere the mantra "for loops are evil"
> because they take up so much time. Of course, as I learn more and watch
> what goes on in this group, it seems like "for loops are sometimes evil"
> would be a better mantra. The question then becomes, when do they become
> evil?
>
> In response to my thread on summing diagonal elements, Craig said that for
> loops aren't always bad if you can do a lot at once, and his code proves
> that you can have some fast loops.
>
> So what defines a slow loop? Is it having a bunch of accesses to
> sub-elements of arrays? Is it just having a bunch of statments? I suppose
> I could do some tests of my own, and I have a little, but it's much more
> fun to hear what you all have to say on the subject. I wouldn't have seen
> any IDL-ku if I just kept my thoughts to myself!
>
> Todd
Simple and short answer:
Loops are then evil, when you can avoid them.
cheers,
:-) marc

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[Message index]

		Re: Philosophy of for loops By: landsman on Tue, 29 August 2000 00:00
		Re: Philosophy of for loops By: davidf on Tue, 29 August 2000 00:00
		Re: Philosophy of for loops By: Nando Iavarone on Tue, 29 August 2000 00:00
		Re: Philosophy of for loops By: Martin Schultz on Tue, 29 August 2000 00:00
		Re: Philosophy of for loops By: marc schellens[1] on Mon, 28 August 2000 23:43
		Re: Philosophy of for loops By: John-David T. Smith on Mon, 28 August 2000 22:14
		Re: Philosophy of for loops By: Craig Markwardt on Mon, 28 August 2000 00:00

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