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Re: 'loop limit expression too large for loop variable type' error [message #72316]

Mon, 30 August 2010 09:56

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On Aug 30, 11:58 am, Chris Torrence <gorth...@gmail.com> wrote:
> On Aug 30, 9:47 am, Paulo Penteado <pp.pente...@gmail.com> wrote:
>
>
>
>
>
>> On Aug 30, 12:36 pm, Snow53 <jennifer_wa...@hotmail.com> wrote:
>
>>> My code runs great on small data sets, but I'm trying to use it for
>>> larger sets and I've started getting an
>>> ''loop limit expression too large for loop variable type' error when I
>>> reach the "for j=0, num_ids-1 do begin". Why is this happening and
>>> how can I fix it?
>
>> It appears that num_ids is 2^16 or larger, which would overflow the
>> loop variable initialized with the type int. Use instead
>
>> for j=0L, num_ids-1
>
>> Or add at the beginning
>
>> compile_opt idl2
>
>> or compile_opt defint32
>
>> Assuming it would fit into a long (2^32).
>
> Or you could upgrade to IDL 8.0, which automatically promotes the loop
> variable to a long or long64 if the loop limit is greater than the
> maximum value for the loop variable. If it isn't greater than the
> maximum, then it leaves it alone.
>
> Cheers,
>
> Chris
> ITTVIS

Damn, that's going to seriously erode my perceived guru status, since
easily half the questions I get boil down to this issue! ;-)

-Jeremy.

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[Message index]

		Re: 'loop limit expression too large for loop variable type' error By: Jeremy Bailin on Mon, 30 August 2010 09:56
		Re: 'loop limit expression too large for loop variable type' error By: Snow53 on Mon, 30 August 2010 08:57
		Re: 'loop limit expression too large for loop variable type' error By: chris_torrence@NOSPAM on Mon, 30 August 2010 08:58
		Re: 'loop limit expression too large for loop variable type' error By: penteado on Mon, 30 August 2010 08:47
		Re: 'loop limit expression too large for loop variable type' error By: Snow53 on Mon, 30 August 2010 08:43
		Re: 'loop limit expression too large for loop variable type' error By: pgrigis on Tue, 31 August 2010 14:27

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