gmx extract-cluster#

Synopsis#

gmx extract-cluster [-f [<.xtc/.trr/...>]] [-s [<.tpr/.gro/...>]]
             [-n [<.ndx>]] [-clusters [<.ndx>]]
             [-o [<.xtc/.trr/...>]] [-b <time>] [-e <time>]
             [-dt <time>] [-tu <enum>] [-fgroup <selection>]
             [-xvg <enum>] [-[no]rmpbc] [-[no]pbc] [-sf <file>]
             [-selrpos <enum>] [-select <selection>] [-vel <enum>]
             [-force <enum>] [-atoms <enum>] [-precision <int>]
             [-starttime <time>] [-timestep <time>] [-box <vector>]

Description#

gmx extract-cluster can be used to extract trajectory frames that correspond to clusters obtained from running gmx cluster with the -clndx option. The module supports writing all GROMACS supported trajectory file formats.

Included is also a selection of possible options to change additional information.

It is possible to write only a selection of atoms to the output trajectory files for each cluster.

Options#

Options to specify input files:

-f [<.xtc/.trr/…>] (traj.xtc) (Optional): Input trajectory or single configuration: xtc trr cpt gro g96 pdb tng
-s [<.tpr/.gro/…>] (topol.tpr) (Optional): Input structure: tpr gro g96 pdb brk ent
-n [<.ndx>] (index.ndx) (Optional): Extra index groups
-clusters [<.ndx>] (cluster.ndx): Name of index file containing frame indices for each cluster, obtained from gmx cluster -clndx.

Options to specify output files:

-o [<.xtc/.trr/…>] (trajout.xtc): Prefix for the name of the trajectory file written for each cluster.: xtc trr cpt gro g96 pdb tng

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 if t MOD dt == first time (ps)
-tu <enum> (ps): Unit for time values: fs, ps, ns, us, ms, s
-fgroup <selection>: Atoms stored in the trajectory file (if not set, assume first N atoms)
-xvg <enum> (xmgrace): Plot formatting: xmgrace, xmgr, none
-[no]rmpbc (yes): Make molecules whole for each frame
-[no]pbc (yes): Use periodic boundary conditions for distance calculation
-sf <file>: Provide selections from files
-selrpos <enum> (atom): Selection reference positions: atom, res_com, res_cog, mol_com, mol_cog, whole_res_com, whole_res_cog, whole_mol_com, whole_mol_cog, part_res_com, part_res_cog, part_mol_com, part_mol_cog, dyn_res_com, dyn_res_cog, dyn_mol_com, dyn_mol_cog
-select <selection>: Selection of atoms to write to the file
-vel <enum> (preserved-if-present): Save velocities from frame if possible: preserved-if-present, always, never
-force <enum> (preserved-if-present): Save forces from frame if possible: preserved-if-present, always, never
-atoms <enum> (preserved-if-present): Decide on providing new atom information from topology or using current frame atom information: preserved-if-present, always-from-structure, never, always
-precision <int> (3): Set output precision to custom value
-starttime <time> (0): Change start time for first frame
-timestep <time> (0): Change time between different frames
-box <vector>: New diagonal box vector for output frame