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gmx-trjorder - Order molecules according to their distance to a group


gmx trjorder [-f [<.xtc/.trr/...>]] [-s [<.tpr/.gro/...>]] [-n [<.ndx>]]
[-o [<.xtc/.trr/...>]] [-nshell [<.xvg>]] [-b <time>]
[-e <time>] [-dt <time>] [-xvg <enum>] [-na <int>]
[-da <int>] [-[no]com] [-r <real>] [-[no]z]


gmx trjorder orders molecules according to the smallest distance to atoms in a reference
group or on z-coordinate (with option -z). With distance ordering, it will ask for a
group of reference atoms and a group of molecules. For each frame of the trajectory the
selected molecules will be reordered according to the shortest distance between atom
number -da in the molecule and all the atoms in the reference group. The center of mass of
the molecules can be used instead of a reference atom by setting -da to 0. All atoms in
the trajectory are written to the output trajectory.

gmx trjorder can be useful for e.g. analyzing the n waters closest to a protein. In that
case the reference group would be the protein and the group of molecules would consist of
all the water atoms. When an index group of the first n waters is made, the ordered
trajectory can be used with any GROMACS program to analyze the n closest waters.

If the output file is a .pdb file, the distance to the reference target will be stored in
the B-factor field in order to color with e.g. Rasmol.

With option -nshell the number of molecules within a shell of radius -r around the
reference group are printed.


Options to specify input files:

-f [<.xtc/.trr/...>] (traj.xtc)
Trajectory: xtc trr cpt gro g96 pdb tng

-s [<.tpr/.gro/...>] (topol.tpr)
Structure+mass(db): tpr gro g96 pdb brk ent

-n [<.ndx>] (index.ndx) (Optional)
Index file

Options to specify output files:

-o [<.xtc/.trr/...>] (ordered.xtc) (Optional)
Trajectory: xtc trr gro g96 pdb tng

-nshell [<.xvg>] (nshell.xvg) (Optional)
xvgr/xmgr file

Other options:

-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)

-xvg <enum>
xvg plot formatting: xmgrace, xmgr, none

-na <int> (3)
Number of atoms in a molecule

-da <int> (1)
Atom used for the distance calculation, 0 is COM

-[no]com (no)
Use the distance to the center of mass of the reference group

-r <real> (0)
Cutoff used for the distance calculation when computing the number of molecules in
a shell around e.g. a protein

-[no]z (no)
Order molecules on z-coordinate

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