[gmx-users] Regarding Box-X Box-Y values from g_energy

Tsjerk Wassenaar tsjerkw at gmail.com
Thu Nov 1 20:26:25 CET 2007


Hi Sona,

If you use isotropic pressure coupling, there will be a single scaling
factor for all three dimensions. So if the box lengths are equal at the
start, they will always remain equal.

Best,

Tsjerk

On 11/1/07, Sona Aramyan <sona_aramyan at yahoo.com> wrote:
>
> Thank you very much for your suggestion.
> I've checked out. I've used isotropic  pressure
> coupling.
> If anyone has more suggestion please share with me.
>
> --- Alan Dodd <anoddlad at yahoo.com> wrote:
>
> > Did you perhaps use semiisotropic pressure coupling?
> >  I'd expect the X-Y values to be the same for that.
> >
> > ----- Original Message ----
> > From: Sona Aramyan <sona_aramyan at yahoo.com>
> > To: Discussion list for GROMACS users
> > <gmx-users at gromacs.org>
> > Sent: Thursday, November 1, 2007 1:18:07 PM
> > Subject: [gmx-users] Regarding Box-X Box-Y values
> > from g_energy
> >
> > Dear gmx-users
> >
> >
> > I have a system consisting from 128dppc bilayer
> > which
> > I've took from
> >
> http://moose.bio.ucalgary.ca/index.php?page=Structures_and_Topologies)
> > and 1 molecule of DALA. I have 2ns run of it. In my
> > g_energy output energy.xvg, in which I have Box-X
> > Box-Y Box-Z values, the values of Box-X and  Box-Y
> > at
> > every step of time have exactly same values.
> >
> > How can this two values change with the same
> > quantity?
> >
> > Is this a real problem, can I use the results of the
> > it or something is wrong with this simulation?
> >
> > I'm sending to you a part of my energy.xvg
> >
> > Any suggestions and advises will be very very
> > appreciated.
> >
> >
> >
> > # This file was created by g_energy
> > # which is part of G R O M A C S:
> > # Gnomes, ROck Monsters And Chili Sauce
> > # All this happened at: Thu Oct 25 15:12:53 2007
> > #
> > @    title "Gromacs Energies"
> > @    xaxis  label "Time (ps)"
> > @    yaxis  label "E (kJ mol\S-1\N)"
> > @TYPE xy
> > @ view 0.15, 0.15, 0.75, 0.85
> > @ legend on
> > @ legend box on
> > @ legend loctype view
> > @ legend 0.78, 0.8
> > @ legend length 2
> > @ s0 legend "Box-X"
> > @ s1 legend "Box-Y"
> > @ s2 legend "Box-Z"
> >     0.000000    6.343720    6.343720    6.777830
> >     4.000000    6.279631    6.279631    6.709337
> >     8.000000    6.246550    6.246550    6.673972
> >   12.000001    6.291696    6.291696    6.722235
> >   16.000000    6.274485    6.274485    6.703831
> >   20.000000    6.259673    6.259673    6.688022
> >   24.000002    6.274458    6.274458    6.703805
> >   28.000002    6.269053    6.269053    6.698055
> >   32.000000    6.273066    6.273066    6.702339
> >   36.000000    6.277720    6.277720    6.707294
> >   40.000000    6.268405    6.268405    6.697363
> >   44.000004    6.262165    6.262165    6.690718
> >   48.000004    6.271516    6.271516    6.700673
> >   52.000004    6.282900    6.282900    6.712825
> >   56.000004    6.268004    6.268004    6.696920
> >   60.000004    6.275951    6.275951    6.705416
> >   64.000000    6.283990    6.283990    6.713978
> >   68.000000    6.268332    6.268332    6.697258
> >   72.000000    6.268672    6.268672    6.697591
> >   76.000000    6.282032    6.282032    6.711858
> >   80.000000    6.275910    6.275910    6.705327
> >   84.000008    6.271963    6.271963    6.701087
> >   88.000008    6.271978    6.271978    6.701059
> >   92.000008    6.265982    6.265982    6.694634
> >   96.000008    6.272739    6.272739    6.701852
> >   100.000008    6.270991    6.270991    6.699977
> >   104.000008    6.259323    6.259323    6.687513
> >   108.000008    6.265584    6.265584    6.694173
> >   112.000008    6.269279    6.269279    6.698182
> >   116.000008    6.267590    6.267590    6.696383
> >   120.000008    6.266372    6.266372    6.695080
> >   124.000008    6.257270    6.257270    6.685329
> >   128.000000    6.263762    6.263762    6.692231
> >   132.000000    6.272191    6.272191    6.701218
> >   136.000000    6.266236    6.266236    6.694935
> >   140.000000    6.261252    6.261252    6.689645
> >   144.000000    6.259418    6.259418    6.687694
> >   148.000000    6.268799    6.268799    6.697742
> >   152.000000    6.274210    6.274210    6.703519
> >   156.000000    6.269886    6.269886    6.698938
> >   160.000000    6.273304    6.273304    6.702565
> >   164.000015    6.270255    6.270255    6.699334
> >   168.000015    6.279771    6.279771    6.709496
> >   172.000015    6.271050    6.271050    6.700203
> >   176.000015    6.258578    6.258578    6.686853
> >   180.000015    6.269828    6.269828    6.698884
> >   184.000015    6.276379    6.276379    6.705905
> >   188.000015    6.260080    6.260080    6.688455
> >   192.000015    6.261606    6.261606    6.690063
> >   196.000015    6.275762    6.275762    6.705174
> >   200.000015    6.263684    6.263684    6.692267
> >
> >
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-- 
Tsjerk A. Wassenaar, Ph.D.
Junior UD (post-doc)
Biomolecular NMR, Bijvoet Center
Utrecht University
Padualaan 8
3584 CH Utrecht
The Netherlands
P: +31-30-2539931
F: +31-30-2537623
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