g_dist − calculates the distances between the centers of mass of two groups
g_dist -f traj.xtc -s topol.tpr -n index.ndx -o dist.xvg -[no]h -nice int -b time -e time -dt time -[no]xvgr -dist real
g_dist can calculate the distance between the centers of mass of two groups of atoms as a function of time. The total distance and its x, y and z components are plotted.
Or when -dist is set, print all the atoms in group 2 that are closer than a certain distance to the center of mass of group 1.
Other programs that calculate distances are g_mindist
and g_bond
-f traj.xtc Input
Generic trajectory: xtc trr trj gro g96 pdb
-s topol.tpr Input
Generic run input: tpr tpb tpa xml
-n index.ndx Input, Opt.
Index file
-o dist.xvg Output, Opt.
xvgr/xmgr file
-[no]h no
Print help info and quit
-nice int 19
Set the nicelevel
-b time 0
First frame (ps) to read from trajectory
-e time 0
Last frame (ps) to read from trajectory
-dt time 0
Only use frame when t MOD dt = first time (ps)
-[no]xvgr yes
Add specific codes (legends etc.) in the output xvg files for the xmgrace program
-dist real 0
Print all atoms in group 2 closer than dist to the center of mass of group 1
More information about the GROMACS suite is available in /usr/share/doc/gromacs or at <http://www.gromacs.org/>.