VMD-L Mailing List

From: John Stone (johns_at_ks.uiuc.edu)
Date: Tue May 05 2009 - 10:17:57 CDT

Olaf,
  You've stumbled upon a bit of outdated documentation. This feature
was removed many years ago as it created undesirable dependencies
between atom selection objects within VMD and the command interpreter
state. This functionality was removed in version 1.74 of AtomSel.C
(if you have the VMD CVS tree handy). With some careful engineering
it might be possible to reintroduce this kind of @selection
feature. One part that's problematic in general is that since VMD
supports multiple text interpreters concurrently, the direct
"$variable" boolean list selection could not be supported now like
it was in the past since it's unclear which command interpreter
context it would reference.
(e.g. if a boolean list variable existed in multiple interpreter contexts,
 which one does the atom selection parser end up using?)

Cheers,
  John

On Thu, Apr 30, 2009 at 11:25:05AM +0200, Olaf Lenz wrote:
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> Hi all!
>
> In the UG of VMD 1.8.7beta1 on page 71, I note that there is the example
> selection "protein and @myselection". Unfortunately, there doesn't seem
> to be any further documentation on this feature.
>
> Does this mean that it is/should be possible to base a selection on an
> existing one? That sound very nice for plugin development! However, it
> doesn't seem to work yet, or does it?
>
> Olaf
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-- 
NIH Resource for Macromolecular Modeling and Bioinformatics
Beckman Institute for Advanced Science and Technology
University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
Email: johns_at_ks.uiuc.edu                 Phone: 217-244-3349
  WWW: http://www.ks.uiuc.edu/~johns/      Fax: 217-244-6078