Hi, An xtc file only contains positions. Your nstvout affects the trr file. Notice how sharing your command line got you the answer you needed ;-)
Mark On Mon, May 28, 2018, 18:12 Atila Petrosian <atila.petros...@gmail.com> wrote: > Dear Justin, > > In my last md simulation, I used > > nstxout = 1000 > nstvout = 1000 > nstxtcout = 1000 > nstenergy = 1000 > nstlog = 1000 > > After your suggestion, I used gmx traj -f npt.xtc -s npt.tpr -ov veloc.xvg > -n index.ndx > > veloc.xvg file is as follows: > > --------------------------------------------------------- > > @ title "Velocity" > @ xaxis label "Time (ps)" > @ yaxis label "Velocity (nm/ps)" > @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 "atom 1 X" > @ s1 legend "atom 1 Y" > @ s2 legend "atom 1 Z" > . > . > . > @ s2838 legend "atom 947 X" > @ s2839 legend "atom 947 Y" > @ s2840 legend "atom 947 Z" *** (last line of file) *** > > ---------------------------------------------------------- > > There is no velocity values. Is my manner wrong? > -- > Gromacs Users mailing list > > * Please search the archive at > http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before > posting! > > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > > * For (un)subscribe requests visit > https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or > send a mail to gmx-users-requ...@gromacs.org. > -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.