[gmx-users] question about energygrps
jalemkul at vt.edu
Sun May 12 14:29:57 CEST 2013
On 5/12/13 2:25 AM, Hyunjin Kim wrote:
> I want to calculate LJ and Electrostatic energies between two groups
> defined in index.ndx during rerun with original trajectory.
> The following is what I tried:
> 1. insert "energygrps r_1 r_25" in the test.mdp file.
> 2. grompp -f test.mdp -c x.gro -o x.tpr -p x.top -n index.ndx
> 3. mdrun -nt 2 -rerun o.trr -s x.tpr -o x.trr -c x.gro -g x.log -e x.ene
> The simulation runs properly, but if I collect energy using g_energy, then
> values of all energy terms are same, although I choose different groups.
Which specific groups did you choose?
> In log file, "energygrp-flags[ 0]: 0".
> I think this means it calculate system energies instead of two specific
> groups I choose.
Some energy terms are decomposable, most are not. There will be obvious
differences in group names in the g_energy output.
Justin A. Lemkul, Ph.D.
Department of Biochemistry
jalemkul[at]vt.edu | (540) 231-9080
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