g_bundle (1) - Linux Manuals
g_bundle: analyzes bundles of axes, e.g. helices
NAMEg_bundle - analyzes bundles of axes, e.g. helices
SYNOPSISg_bundle -f traj.xtc -s topol.tpr -n index.ndx -ol bun_len.xvg -od bun_dist.xvg -oz bun_z.xvg -ot bun_tilt.xvg -otr bun_tiltr.xvg -otl bun_tiltl.xvg -ok bun_kink.xvg -okr bun_kinkr.xvg -okl bun_kinkl.xvg -oa axes.pdb -[no]h -nice int -b time -e time -dt time -tu enum -[no]xvgr -na int -[no]z
DESCRIPTIONg_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 vectors.
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.
FILES-f traj.xtc Input
-nice int 19
-b time 0
-e time 0
-dt time 0
-tu enum ps
-na int 0