On 5/28/18 11:49 AM, Atila Petrosian wrote:
Dear Mark,
Thanks for your answer.

"Only if you asked for velocity information to be written to the
trajectory, with nstvout"

Usually, I use the following lines in mdp files:

nstxout = 1000
nstvout = 1000
nstxtcout         = 1000
nstenergy = 1000
nstlog = 1000

But, I get only position of atoms  in time steps using VMD while I need to
the velocity values for each time in time steps.

Inspect the contents of your .trr file to verify what you have (is what you "usually" do what you "always" do, or did you forget something in this case?) and then, if velocities are present, extract what you need with gmx traj.

-Justin

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Justin A. Lemkul, Ph.D.
Assistant Professor
Virginia Tech Department of Biochemistry

303 Engel Hall
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jalem...@vt.edu | (540) 231-3129
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