SYNOPSIS

gmx hydorder [-f [<.xtc/.trr/...>]] [-n [<.ndx>]]

             [-s [<.tpr/.tpb/...>]] [-o [<.xpm> [...]]]
             [-or [<.out> [...]]] [-Spect [<.out> [...]]]
             [-nice <int>] [-b <time>] [-e <time>] [-dt <time>]
             [-[no]w] [-d <enum>] [-bw <real>] [-sgang1 <real>]
             [-sgang2 <real>] [-tblock <int>] [-nlevel <int>]

DESCRIPTION

gmx hydorder computes the tetrahedrality order parameters around a given atom. Both angle an distance order parameters are calculated. See P.-L. Chau and A.J. Hardwick, Mol. Phys., 93, (1998), 511-518. for more details.

gmx hydorder calculates the order parameter in a 3d-mesh in the box, and with 2 phases in the box gives the user the option to define a 2D interface in time separating the faces by specifying parameters -sgang1 and -sgang2 (it is important to select these judiciously).

OPTIONS

Options to specify input and output files:

-f [<.xtc/.trr/...>] (traj.xtc) (Input)

    Trajectory: xtc trr cpt trj gro g96 pdb tng

-n [<.ndx>] (index.ndx) (Input)

    Index file

-s [<.tpr/.tpb/...>] (topol.tpr) (Input)

    Run input file: tpr tpb tpa

-o [<.xpm> [...]] (intf.xpm) (Output)

    X PixMap compatible matrix file

-or [<.out> [...]] (raw.out) (Output, Optional)

    Generic output file

-Spect [<.out> [...]] (intfspect.out) (Output, Optional)

    Generic output file

Other options:

-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]w (no)

    View output .xvg, .xpm, .eps and .pdb files

-d <enum> (z)

    Direction of the normal on the membrane: z, x, y

-bw <real> (1)

    Binwidth of box mesh

-sgang1 <real> (1)

    tetrahedral angle parameter in Phase 1 (bulk)

-sgang2 <real> (1)

    tetrahedral angle parameter in Phase 2 (bulk)

-tblock <int> (1)

    Number of frames in one time-block average

-nlevel <int> (100)

    Number of Height levels in 2D - XPixMaps

RELATED TO g_hydorder_d…

gromacs(7)

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