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Re: Empty FOREACH loop [message #75101]

Tue, 15 February 2011 06:14

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 2/14/11 8:08 pm, Paulo Penteado wrote:
>
> I also get the temporary variables stuff, and agree that things like
>
> foreach el,!null do print,el
> foreach el,[] do print,el
> foreach el,{} do print,el
>
> Should all do nothing, with no errors.
>
> But if foreach is given a named variable that is !null it does nothing
> as expected:
>
> IDL> n=!null
> IDL> foreach el,n do print,el

Even more interesting:

IDL> print, !version
{ x86_64 darwin unix Mac OS X 8.0.1 Oct 5 2010 64 64}
IDL> groups = !null
IDL> foreach g, groups do help, g

But:

IDL> print, !version
{ x86_64 linux unix linux 8.0 Jun 18 2010 64 64}
IDL> groups = !null
IDL> foreach g, groups do help, g
% Variable is undefined: GROUPS.
% Execution halted at: $MAIN$

This must be a fix in 8.0.1. I will do some more research, but sheds
some light on the original situation that was causing me some problems
debugging.

Mike
--
www.michaelgalloy.com
Research Mathematician
Tech-X Corporation

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[Message index]

		Re: Empty FOREACH loop By: Michael Galloy on Tue, 15 February 2011 06:14
		Re: Empty FOREACH loop By: penteado on Mon, 14 February 2011 19:08
		Re: Empty FOREACH loop By: Dick Jackson on Fri, 12 October 2012 14:33

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