NAME

       g_principal - calculates axes of inertia for a group of atoms

       VERSION 4.6.5

SYNOPSIS

       g_principal  -f  traj.xtc  -s  topol.tpr  -n  index.ndx  -a1  axis1.dat  -a2 axis2.dat -a3
       axis3.dat -om moi.dat -[no]h -[no]version -nice int -b time -e  time  -dt  time  -tu  enum
       -[no]w -[no]foo

DESCRIPTION

        g_principal calculates the three principal axes of inertia for a group of atoms.

FILES

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

       -s topol.tpr Input
        Structure+mass(db): tpr tpb tpa gro g96 pdb

       -n index.ndx Input, Opt.
        Index file

       -a1 axis1.dat Output
        Generic data file

       -a2 axis2.dat Output
        Generic data file

       -a3 axis3.dat Output
        Generic data file

       -om moi.dat Output
        Generic data file

OTHER OPTIONS

       -[no]hno
        Print help info and quit

       -[no]versionno
        Print version 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)

       -tu enum ps
        Time unit:  fs,  ps,  ns,  us,  ms or  s

       -[no]wno
        View output  .xvg,  .xpm,  .eps and  .pdb files

       -[no]foono
        Dummy option to avoid empty array

SEE ALSO

       gromacs(7)

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

                                          Mon 2 Dec 2013                           g_principal(1)