NAME

       trjcat - concatenates trajectory files

       VERSION 4.6.5

SYNOPSIS

       trjcat  -f  traj.xtc -o trajout.xtc -n index.ndx -demux remd.xvg -[no]h -[no]version -nice
       int -tu enum -xvg enum -b time -e time -dt time -prec int -[no]vel -[no]settime  -[no]sort
       -[no]keeplast -[no]overwrite -[no]cat

DESCRIPTION

         trjcat  concatenates  several input trajectory files in sorted order.  In case of double
       time frames the one in the later file is used.  By specifying  -settime you will be  asked
       for  the  start  time  of each file. The input files are taken from the command line, such
       that a command like  trjcat -f *.trr -o fixed.trr should do the trick.  Using   -cat,  you
       can  simply  paste  several  files  together without removal of frames with identical time
       stamps.

       One important option is inferred when the output file is amongst the input files. In  that
       case  that  particular  file  will  be  appended to which implies you do not need to store
       double the amount of data.  Obviously the file to append to has to be the one with  lowest
       starting time since one can only append at the end of a file.

       If  the   -demux option is given, the N trajectories that are read, are written in another
       order as specified in the  .xvg file.  The  .xvg file should contain something like:

        0  0  1  2  3  4  5

       2  1  0  2  3  5  4

       Where the first number is the time, and subsequent numbers point  to  trajectory  indices.
       The  frames  corresponding to the numbers present at the first line are collected into the
       output trajectory. If the number of frames in the trajectory does not match  that  in  the
       .xvg file then the program tries to be smart. Beware.

FILES

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

       -o trajout.xtc Output, Mult.
        Trajectory: xtc trr trj gro g96 pdb

       -n index.ndx Input, Opt.
        Index file

       -demux remd.xvg Input, Opt.
        xvgr/xmgr file

OTHER OPTIONS

       -[no]hno
        Print help info and quit

       -[no]versionno
        Print version info and quit

       -nice int 19
        Set the nicelevel

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

       -xvg enum xmgrace
        xvg plot formatting:  xmgrace,  xmgr or  none

       -b time -1
        First time to use (ps)

       -e time -1
        Last time to use (ps)

       -dt time 0
        Only write frame when t MOD dt = first time (ps)

       -prec int 3
        Precision for  .xtc and  .gro writing in number of decimal places

       -[no]velyes
        Read and write velocities if possible

       -[no]settimeno
        Change starting time interactively

       -[no]sortyes
        Sort trajectory files (not frames)

       -[no]keeplastno
        Keep overlapping frames at end of trajectory

       -[no]overwriteno
        Overwrite overlapping frames during appending

       -[no]catno
        Do not discard double time frames

SEE ALSO

       gromacs(7)

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

                                          Mon 2 Dec 2013                                trjcat(1)