On 2/20/13 12:46 AM, Hector Manuel Manzanilla Granados wrote:
Excuseme dear Dr. Tomas, forgiveme the boldness,
I'm new with this, and I dont know who to address
when I have a problem. My name is Hector, and  I'm
tryng to install the gromacs software in my computer;
I follewed all the steps in the online manual, however
when I compile Gromacs with the instruction: ngmx, I receiveƧ
the following sentence:


Please don't hijack existing threads with unrelated questions. Start a new thread by sending a new mail to [email protected].


:-)  G  R  O  M  A  C  S  (-:

            Glycine aRginine prOline Methionine Alanine Cystine Serine

                             :-)  VERSION 4.0.7  (-:


       Written by David van der Spoel, Erik Lindahl, Berk Hess, and others.
        Copyright (c) 1991-2000, University of Groningen, The Netherlands.
              Copyright (c) 2001-2008, The GROMACS development team,
             check out http://www.gromacs.org for more information.

          This program is free software; you can redistribute it and/or
           modify it under the terms of the GNU General Public License
          as published by the Free Software Foundation; either version 2
              of the License, or (at your option) any later version.

                                  :-)  ngmx  (-:

Option     Filename  Type         Description
------------------------------------------------------------
   -f       traj.xtc  Input        Trajectory: xtc trr trj gro g96 pdb cpt
   -s      topol.tpr  Input        Run input file: tpr tpb tpa
   -n      index.ndx  Input, Opt.  Index file

Option       Type   Value   Description
------------------------------------------------------
-[no]h       bool   no      Print help info and quit
-nice        int    0       Set the nicelevel
-b           time   0       First frame (ps) to read from trajectory
-e           time   0       Last frame (ps) to read from trajectory
-dt          time   0       Only use frame when t MOD dt = first time (ps)


-------------------------------------------------------
Program ngmx, VERSION 4.0.7
Source code file: ../../../../src/gmxlib/gmxfio.c, line: 737

Can not open file:
topol.tpr
-------------------------------------------------------

"It's Calling Me to Break my Bonds, Again..." (Van der Graaf)


I don't understand what to do with this, may be you can get me a hint,


You haven't provided any input for ngmx to use, so it's trying to use default file names for the required input. You must supply suitable files that you want to visualize using -s and -f. Please do some basic Gromacs tutorial material to get yourself used to a normal workflow, expected options for common commands, etc. For what it's worth, there are far better visualization programs available (for free) that surpass ngmx in terms of features.

-Justin

--
========================================

Justin A. Lemkul, Ph.D.
Research Scientist
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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