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Re: FOR loop ends one above where it's supposed to [message #71125 is a reply to message #71124]

Wed, 02 June 2010 08:57

pgrigis
Messages: 436
Registered: September 2007

Senior Member

On Jun 1, 8:26 pm, Bulgakovv <alex.ph.sjog...@gmail.com> wrote:
> Maybe there are previous posts about this, but I tried to google
> around without any success so I'll throw the question out.
>
> When I make a FOR loop from for example 0 to 5, the counter ends on
> the value one step above what I stated. Here's an example:
>
>> for i =0,5 do print,i
>
> 0
> 1
> 2
> 3
> 4
> 5>print,i
>
> 6
>
> Is this how it's supposed to be in IDL? To me it seems a little bit
> weird, why would the FOR loop count one extra step in the end? Took me
> a couple of hours to realize what was going on in my code as I took
> for granted this was not the case, so now I'm interested in
> understanding why IDL is behaving like this. Thanks and sorry if
> reposting!

While people here gave a logical explanation as to what is happening,
I would say that the *safest* practice in your programming is to not
use the for loop index variable ("i" in this case) for anything else
in your program. That will make the code much easier to write, read
and understand.

Ciao,
Paolo

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[Message index]

		Re: FOR loop ends one above where it's supposed to By: Bulgakovv on Wed, 02 June 2010 09:49
		Re: FOR loop ends one above where it's supposed to By: penteado on Wed, 02 June 2010 09:07
		Re: FOR loop ends one above where it's supposed to By: pgrigis on Wed, 02 June 2010 08:57
		Re: FOR loop ends one above where it's supposed to By: cameron bowles on Tue, 01 June 2010 22:36
		Re: FOR loop ends one above where it's supposed to By: cameron bowles on Tue, 01 June 2010 22:34
		Re: FOR loop ends one above where it's supposed to By: mankoff on Tue, 01 June 2010 17:53

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