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






Sergio Manzetti

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From: "Justin Lemkul" <jalem...@vt.edu>
To: "gmx-users" <gmx-us...@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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Virginia Tech Department of Biochemistry

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