1 .TH g_sorient 1 "Fri 19 Apr 2013" "" "GROMACS suite, VERSION 4.5.7"
3 g_sorient - analyzes solvent orientation around solutes
9 .BI "\-s" " topol.tpr "
10 .BI "\-n" " index.ndx "
11 .BI "\-o" " sori.xvg "
12 .BI "\-no" " snor.xvg "
13 .BI "\-ro" " sord.xvg "
14 .BI "\-co" " scum.xvg "
15 .BI "\-rc" " scount.xvg "
17 .BI "\-[no]version" ""
32 \&\fB g_sorient\fR analyzes solvent orientation around solutes.
33 \&It calculates two angles between the vector from one or more
34 \&reference positions to the first atom of each solvent molecule:
37 \&theta_1: the angle with the vector from the first atom of the solvent
38 \&molecule to the midpoint between atoms 2 and 3.
40 \&theta_2: the angle with the normal of the solvent plane, defined by the
41 \&same three atoms, or, when the option \fB \-v23\fR is set,
42 \&the angle with the vector between atoms 2 and 3.
45 \&The reference can be a set of atoms or
46 \&the center of mass of a set of atoms. The group of solvent atoms should
47 \&consist of 3 atoms per solvent molecule.
48 \&Only solvent molecules between \fB \-rmin\fR and \fB \-rmax\fR are
49 \&considered for \fB \-o\fR and \fB \-no\fR each frame.
52 \&\fB \-o\fR: distribtion of cos(theta_1) for rmin=r=rmax.
55 \&\fB \-no\fR: distribution of cos(theta_2) for rmin=r=rmax.
58 \&\fB \-ro\fR: cos(theta_1) and 3cos(2theta_2)\-1 as a function of the
62 \&\fB \-co\fR: the sum over all solvent molecules within distance r
63 \&of cos(theta_1) and 3cos(2(theta_2)\-1) as a function of r.
66 \&\fB \-rc\fR: the distribution of the solvent molecules as a function of r
70 Trajectory: xtc trr trj gro g96 pdb cpt
72 .BI "\-s" " topol.tpr"
74 Structure+mass(db): tpr tpb tpa gro g96 pdb
76 .BI "\-n" " index.ndx"
84 .BI "\-no" " snor.xvg"
88 .BI "\-ro" " sord.xvg"
92 .BI "\-co" " scum.xvg"
96 .BI "\-rc" " scount.xvg"
102 Print help info and quit
104 .BI "\-[no]version" "no "
105 Print version info and quit
107 .BI "\-nice" " int" " 19"
110 .BI "\-b" " time" " 0 "
111 First frame (ps) to read from trajectory
113 .BI "\-e" " time" " 0 "
114 Last frame (ps) to read from trajectory
116 .BI "\-dt" " time" " 0 "
117 Only use frame when t MOD dt = first time (ps)
120 View output \fB .xvg\fR, \fB .xpm\fR, \fB .eps\fR and \fB .pdb\fR files
122 .BI "\-xvg" " enum" " xmgrace"
123 xvg plot formatting: \fB xmgrace\fR, \fB xmgr\fR or \fB none\fR
125 .BI "\-[no]com" "no "
126 Use the center of mass as the reference postion
128 .BI "\-[no]v23" "no "
129 Use the vector between atoms 2 and 3
131 .BI "\-rmin" " real" " 0 "
132 Minimum distance (nm)
134 .BI "\-rmax" " real" " 0.5 "
135 Maximum distance (nm)
137 .BI "\-cbin" " real" " 0.02 "
138 Binwidth for the cosine
140 .BI "\-rbin" " real" " 0.02 "
143 .BI "\-[no]pbc" "no "
144 Check PBC for the center of mass calculation. Only necessary when your reference group consists of several molecules.
149 More information about \fBGROMACS\fR is available at <\fIhttp://www.gromacs.org/\fR>.