Query: g_filter
OS: debian
Section: 1
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
g_filter(1) GROMACS suite, VERSION 4.5.4-dev-20110404-bc5695c g_filter(1)NAMEg_filter - frequency filters trajectories, useful for making smooth movies VERSION 4.5.4-dev-20110404-bc5695cSYNOPSISg_filter -f traj.xtc -s topol.tpr -n index.ndx -ol lowpass.xtc -oh highpass.xtc -[no]h -[no]version -nice int -b time -e time -dt time -[no]w -nf int -[no]all -[no]nojump -[no]fitDESCRIPTIONg_filter performs frequency filtering on a trajectory. The filter shape is cos(pi t/A) + 1 from -A to +A, where A is given by the option -nf times the time step in the input trajectory. This filter reduces fluctuations with period A by 85%, with period 2*A by 50% and with period 3*A by 17% for low-pass filtering. Both a low-pass and high-pass filtered trajectory can be written. Option -ol writes a low-pass filtered trajectory. A frame is written every -nf input frames. This ratio of filter length and output interval ensures a good suppression of aliasing of high-frequency motion, which is useful for making smooth movies. Also averages of prop- erties which are linear in the coordinates are preserved, since all input frames are weighted equally in the output. When all frames are needed, use the -all option. Option -oh writes a high-pass filtered trajectory. The high-pass filtered coordinates are added to the coordinates from the structure file. When using high-pass filtering use -fit or make sure you use a trajectory that has been fitted on the coordinates in the structure file.FILES-f traj.xtc Input Trajectory: xtc trr trj gro g96 pdb cpt -s topol.tpr Input, Opt. Structure+mass(db): tpr tpb tpa gro g96 pdb -n index.ndx Input, Opt. Index file -ol lowpass.xtc Output, Opt. Trajectory: xtc trr trj gro g96 pdb -oh highpass.xtc Output, Opt. Trajectory: xtc trr trj gro g96 pdbOTHER 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) -[no]wno View output .xvg, .xpm, .eps and .pdb files -nf int 10 Sets the filter length as well as the output interval for low-pass filtering -[no]allno Write all low-pass filtered frames -[no]nojumpyes Remove jumps of atoms across the box -[no]fitno Fit all frames to a reference structureSEE ALSOgromacs(7) More information about GROMACS is available at <http://www.gromacs.org/>. Mon 4 Apr 2011 g_filter(1)
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