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Re: 'loop limit expression too large for loop variable type' error [message #72320 is a reply to message #72319]

Mon, 30 August 2010 08:58

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

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

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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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