From: John Stone (
Date: Thu Mar 27 2008 - 14:04:35 CDT

  Yes, the behavior is by design, as it improves default trajectory
animation and atom selection performance by a huge factor. That said,
you can very easily cause atom selections to be re-evaluated dynamically
when necessary:

If this is part of a script, then you want:
    $sel frame
    $sel update

If you're just talking about selections for the graphical representations,
then use the "Trajectory" tab and enable the checkbox labelled
"update selection every frame".

  John Stone

On Thu, Mar 27, 2008 at 02:59:25PM -0400, Maxim Paliy wrote:
> Dear VMD/NAMD experts.
> I find, that when I select some stuff using "within" keyword
> (e.g. "within x of something") such selection
> is not updated throughout DCD trajectory?
> Is this behaviour by design?
> How to make the selection "within" to update for every frame?
> Thanks in advance for any suggestions
> Maxim

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