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NAME

       g_dist  -  calculates  the distances between the centers of mass of two
       groups

       VERSION 4.0.1

SYNOPSIS

       g_dist  -f  traj.xtc  -s  topol.tpr  -n  index.ndx  -o   dist.xvg   -lt
       lifetime.xvg  -[no]h -nice int -b time -e time -dt time -[no]xvgr -dist
       real

DESCRIPTION

       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.

       With  options   -lt  and   -dist the number of contacts of all atoms in
       group 2 that are closer than a certain distance to the center  of  mass
       of  group  1 are plotted as a function of the time that the contact was
       continously present.

       Other programs that calculate distances are  g_mindist and  g_bond.

FILES

       -f traj.xtc Input
        Trajectory: xtc trr trj gro g96 pdb cpt

       -s topol.tpr Input
        Run input file: tpr tpb tpa

       -n index.ndx Input, Opt.
        Index file

       -o dist.xvg Output, Opt.
        xvgr/xmgr file

       -lt lifetime.xvg Output, Opt.
        xvgr/xmgr file

OTHER OPTIONS

       -[no]hno
        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]xvgryes
        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

SEE ALSO

       gromacs(7)

       More     information     about     GROMACS     is     available      at
       <http://www.gromacs.org/>.

                                Thu 16 Oct 2008                      g_dist(1)