[gmx-users] DPOSRES not working

[Justin Lemkul]

On 9/7/17 8:45 AM, Sergio Manzetti wrote:
> It seems that GMX simply didn't write out the correct frame. The confout.gro file written out is written at the same time as the trajectories, and for some reason, this confout.gro file has nothing to do with the last output frame from the sims, when produced by gmx trjconv..

confout.gro is the final frame, re-wrapped for PBC.  So it may "look" 
different from the final frame of the trajectory, but it's not.

Unless you actually provide answers to the questions I asked and any 
actual commands you're issuing (e.g. what did you do when you say 
"produced by gmx trjconv" for instance?), then there's nothing anyone 
here can do to help you.  We can't see what you're seeing or interpret 
what's in your mind :)

-Justin

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> Sergio Manzetti
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> From: "Justin Lemkul" <jalemkul at vt.edu>
> To: "gmx-users" <gmx-users at gromacs.org>
> Sent: Thursday, September 7, 2017 2:28:23 PM
> Subject: Re: [gmx-users] DPOSRES not working
>
> On 9/7/17 5:28 AM, Sergio Manzetti wrote:
>> Hi Johannes, yes, they are there in both cases:
>>
>> ; Include Position restraint file
>> #ifdef POSRES
>> #include "posre_DNA_chain_E.itp"
>> #endif
>>
> Do you have a position restraint energy term written in your .log file,
> and if so, what is its magnitude? Does your DNA start at the middle of
> the box (GROMACS convention) or at the coordinate origin (like other
> software)? If you watch the trajectory evolve, what happens? Does the
> DNA move a lot or does it just bounce back and forth around its original
> position (suggesting your box is simply too small and any time an atom
> crosses a boundary, you get a jump)?
>
> -Justin
>

-- 
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Justin A. Lemkul, Ph.D.
Assistant Professor
Virginia Tech Department of Biochemistry

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