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gmx-bundle - Analyze bundles of axes, e.g., helices


gmx bundle [-f [<.xtc/.trr/...>]] [-s [<.tpr/.gro/...>]] [-n [<.ndx>]]
[-ol [<.xvg>]] [-od [<.xvg>]] [-oz [<.xvg>]]
[-ot [<.xvg>]] [-otr [<.xvg>]] [-otl [<.xvg>]]
[-ok [<.xvg>]] [-okr [<.xvg>]] [-okl [<.xvg>]]
[-oa [<.pdb>]] [-b <time>] [-e <time>] [-dt <time>]
[-tu <enum>] [-xvg <enum>] [-na <int>] [-[no]z]


gmx bundle analyzes bundles of axes. The axes can be for instance helix axes. The program
reads two index groups and divides both of them in -na parts. The centers of mass of these
parts define the tops and bottoms of the axes. Several quantities are written to file:
the axis length, the distance and the z-shift of the axis mid-points with respect to the
average center of all axes, the total tilt, the radial tilt and the lateral tilt with
respect to the average axis.

With options -ok, -okr and -okl the total, radial and lateral kinks of the axes are
plotted. An extra index group of kink atoms is required, which is also divided into -na
parts. The kink angle is defined as the angle between the kink-top and the bottom-kink

With option -oa the top, mid (or kink when -ok is set) and bottom points of each axis are
written to a .pdb file each frame. The residue numbers correspond to the axis numbers.
When viewing this file with Rasmol, use the command line option -nmrpdb, and type set axis
true to display the reference axis.


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:

-ol [<.xvg>] (bun_len.xvg)
xvgr/xmgr file

-od [<.xvg>] (bun_dist.xvg)
xvgr/xmgr file

-oz [<.xvg>] (bun_z.xvg)
xvgr/xmgr file

-ot [<.xvg>] (bun_tilt.xvg)
xvgr/xmgr file

-otr [<.xvg>] (bun_tiltr.xvg)
xvgr/xmgr file

-otl [<.xvg>] (bun_tiltl.xvg)
xvgr/xmgr file

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

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

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

-oa [<.pdb>] (axes.pdb) (Optional)
Protein data bank 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)

-tu <enum> (ps)
Unit for time values: fs, ps, ns, us, ms, s

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

-na <int> (0)
Number of axes

-[no]z (no)
Use the z-axis as reference instead of the average axis

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