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Re: loop limit ??? [message #53584 is a reply to message #53583]

Wed, 18 April 2007 14:12

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On Apr 18, 2:54 pm, kostis <kostis...@gmail.com> wrote:
> i wouldnt expect that IDL has a limit for loops !!
> trying a loop of 50.000 steps i got the message:
>
> % Compiled module: TRAJECTORY.
> % Loop limit expression too large for loop variable type.
> <LONG ( 49999)>.
> % Execution halted at: TRAJECTORY 16 /home/kostis/PROJECT
> LARMOR/dipole/trajectory.pro
> % $MAIN$
>
> Why is this?
> This means i cant have bigger loops... or is there a trick??

There's a "trick". A FOR loop variable gets it type from the "start"
value of the loop and it doesn't change in the course of the loop.

So, (note the 0L -- it's the "trick"):

for i = 0L, 50000L do begin
; stuff here
endfor

should do it for you.

Mike
--
www.michaelgalloy.com

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[Message index]

		Re: loop limit ??? By: mmeron on Wed, 18 April 2007 15:28
		Re: loop limit ??? By: Michael Galloy on Wed, 18 April 2007 15:06
		Re: loop limit ??? By: cgguido on Wed, 18 April 2007 14:45
		Re: loop limit ??? By: Foldy Lajos on Wed, 18 April 2007 14:02
		Re: loop limit ??? By: Michael Galloy on Wed, 18 April 2007 14:12

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