Hi,

If you haven't done anything special such as concatenating or cutting the energy file in parts after the simulation, I'd say it looks like a bug. Please create an entry at bugzilla.gromacs.org , upload the tpr, and we'll have a look at it.

Cheers,

Erik

On Apr 27, 2007, at 1:36 PM, merc mertens wrote:

hello,

i use VERSION 3.3.1. output from

g_energy -f (ener.edr) -sum -o (energy.xvg)

is similar as with the "-b 2000" flag:

Statistics over 2000001 steps [ 0.0000 thru 4000.0000 ps ], 1 data sets

Energy Average RMSD Fluct. Drift Tot-Drift ---------------------------------------------------------------------- --------- Coul-SR:Protein-trna -0.0237376 5.19622 0 0.0118159 47.2635 Total -0.0237376 -- -- -- --

in comparison from the xvg:

@ s0 legend "Coul-SR:Protein-trna"
@ s1 legend "Sum"
    0.000000  -1107.173950
  100.000000  -1201.496948
  200.000000  -1142.097778
  300.000000  -1082.942383
  400.000000  -1063.810547
  500.000000  -1058.372314
  600.000000  -1061.625488
  700.000000  -1326.301270
  800.000000  -1233.008667
  900.000000  -1169.119751
  1000.000000  -1082.796021
  1100.000000  -1261.529175
  1200.000000  -1257.951904
  1300.000000  -1310.429565
  1400.000000  -1251.131592
  1500.000000  -1235.889893
  1600.000000  -1233.731201
  1700.000000  -1077.790649
  1800.000000  -1134.157471
  1900.000000  -1231.017334
  2000.000000  -1171.813721
  2100.000000  -1311.884399
  2200.000000  -1142.125366
  2300.000000  -1169.552979
  2400.000000  -1205.442383
  2500.000000  -1189.931519
  2600.000000  -1148.712402
  2700.000000  -1003.882751
  2800.000000  -1104.013794
  2900.000000  -1076.985474
  3000.000000  -1131.902832
  3100.000000  -1135.494995
  3200.000000  -1080.656250
  3300.000000  -1257.183594
  3400.000000  -1138.595215
  3500.000000  -1107.039062
  3600.000000  -1051.498657
  3700.000000  -1139.150391
  3800.000000  -1070.984741
  3900.000000  -1186.214600
  4000.000000  -1129.730713

i think that the ener.edr only should contain only those steps listed in the xvg.

cheers,
merc


-------- Original-Nachricht --------
Datum: Fri, 27 Apr 2007 13:04:04 +0200
Von: Erik Lindahl <[EMAIL PROTECTED]>
An: Discussion list for GROMACS users <gmx-users@gromacs.org>
Betreff: Re: [gmx-users] g_energy sum

Oops,

Sometimes it helps to read the mail. Mea culpa - forget my previous
answer, this is something else.

It could simply be a bug in g_energy; which version are you using,
and what do you get if you remove "-b 2000" (i.e. include all steps)?

Cheers,

Erik

On Apr 27, 2007, at 12:24 PM, merc mertens wrote:

hello,

when i calculate energies with

g_energy -f (ener.edr) -b 2000 -sum -o (energy.xvg)

e.g. i get this average in the log:

Statistics over 1000001 steps [ 2000.0000 thru 4000.0000 ps ], 1
data sets

Energy                      Average       RMSD     Fluct.
Drift  Tot-Drift
-------------------------------------------------------------------- --
---------
Coul-SR:Protein-trna     -0.0239528          0          0
0.0381909    76.3818
Total                    -0.0239528         --         --
--         --


but i get this in the output energy.xvg:

@ s0 legend "Coul-SR:Protein-trna"
@ s1 legend "Sum"
  2000.000000  -1171.813721
  2100.000000  -1311.884399
  2200.000000  -1142.125366
  2300.000000  -1169.552979
  2400.000000  -1205.442383
  2500.000000  -1189.931519
  2600.000000  -1148.712402
  2700.000000  -1003.882751
  2800.000000  -1104.013794
  2900.000000  -1076.985474
  3000.000000  -1131.902832
  3100.000000  -1135.494995
  3200.000000  -1080.656250
  3300.000000  -1257.183594
  3400.000000  -1138.595215
  3500.000000  -1107.039062
  3600.000000  -1051.498657
  3700.000000  -1139.150391
  3800.000000  -1070.984741
  3900.000000  -1186.214600
  4000.000000  -1129.730713

the average energies from the log and the xvg do not match. does
anybody know what is wrong here?
thank you in advance,

merc
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