Provided by: gromacs-data_4.6.5-1build1_all
g_potential - calculates the electrostatic potential across the box VERSION 4.6.5
g_potential -f traj.xtc -n index.ndx -s topol.tpr -o potential.xvg -oc charge.xvg -of field.xvg -[no]h -[no]version -nice int -b time -e time -dt time -[no]w -xvg enum -d string -sl int -cb int -ce int -tz real -[no]spherical -ng int -[no]correct
g_potential computes the electrostatical potential across the box. The potential is calculated by first summing the charges per slice and then integrating twice of this charge distribution. Periodic boundaries are not taken into account. Reference of potential is taken to be the left side of the box. It is also possible to calculate the potential in spherical coordinates as function of r by calculating a charge distribution in spherical slices and twice integrating them. epsilon_r is taken as 1, but 2 is more appropriate in many cases.
-f traj.xtc Input Trajectory: xtc trr trj gro g96 pdb cpt -n index.ndx Input Index file -s topol.tpr Input Run input file: tpr tpb tpa -o potential.xvg Output xvgr/xmgr file -oc charge.xvg Output xvgr/xmgr file -of field.xvg Output xvgr/xmgr file
-[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 -xvg enum xmgrace xvg plot formatting: xmgrace, xmgr or none -d string Z Take the normal on the membrane in direction X, Y or Z. -sl int 10 Calculate potential as function of boxlength, dividing the box in this number of slices. -cb int 0 Discard this number of first slices of box for integration -ce int 0 Discard this number of last slices of box for integration -tz real 0 Translate all coordinates by this distance in the direction of the box -[no]sphericalno Calculate spherical thingie -ng int 1 Number of groups to consider -[no]correctno Assume net zero charge of groups to improve accuracy
- Discarding slices for integration should not be necessary.
gromacs(7) More information about GROMACS is available at <http://www.gromacs.org/>. Mon 2 Dec 2013 g_potential(1)