1 .TH g_densmap 1 "Thu 16 Oct 2008"
3 g_densmap - calculates 2D planar or axial-radial density maps
10 .BI "-n" " index.ndx "
11 .BI "-o" " densmap.xpm "
31 g_densmap computes 2D number-density maps.
32 It can make planar and axial-radial density maps.
35 file can be visualized with for instance xv
36 and can be converted to postscript with xpm2ps.
40 The default analysis is a 2-D number-density map for a selected
41 group of atoms in the x-y plane.
42 The averaging direction can be changed with the option
49 are set only atoms that are
50 within the limit(s) in the averaging direction are taken into account.
51 The grid spacing is set with the option
59 size is set by this option.
60 Box size fluctuations are properly taken into account.
68 are set, an axial-radial
69 number-density map is made. Three groups should be supplied, the centers
70 of mass of the first two groups define the axis, the third defines the
71 analysis group. The axial direction goes from -amax to +amax, where
72 the center is defined as the midpoint between the centers of mass and
73 the positive direction goes from the first to the second center of mass.
74 The radial direction goes from 0 to rmax or from -rmax to +rmax
81 The normalization of the output is set with the
84 The default produces a true number density. Unit
87 the normalization for the averaging or the angular direction.
90 produces the count for each grid cell.
91 When you do not want the scale in the output to go
92 from zero to the maximum density, you can set the maximum
99 Trajectory: xtc trr trj gro g96 pdb cpt
101 .BI "-s" " topol.tpr"
103 Structure+mass(db): tpr tpb tpa gro g96 pdb
105 .BI "-n" " index.ndx"
109 .BI "-o" " densmap.xpm"
111 X PixMap compatible matrix file
115 Print help info and quit
117 .BI "-nice" " int" " 19"
120 .BI "-b" " time" " 0 "
121 First frame (ps) to read from trajectory
123 .BI "-e" " time" " 0 "
124 Last frame (ps) to read from trajectory
126 .BI "-dt" " time" " 0 "
127 Only use frame when t MOD dt = first time (ps)
130 View output xvg, xpm, eps and pdb files
132 .BI "-bin" " real" " 0.02 "
135 .BI "-aver" " enum" " z"
136 The direction to average over:
144 .BI "-xmin" " real" " -1 "
145 Minimum coordinate for averaging
147 .BI "-xmax" " real" " -1 "
148 Maximum coordinate for averaging
150 .BI "-n1" " int" " 0"
151 Number of grid cells in the first direction
153 .BI "-n2" " int" " 0"
154 Number of grid cells in the second direction
156 .BI "-amax" " real" " 0 "
157 Maximum axial distance from the center
159 .BI "-rmax" " real" " 0 "
160 Maximum radial distance
162 .BI "-[no]mirror" "no "
163 Add the mirror image below the axial axis
165 .BI "-unit" " enum" " nm-3"
174 .BI "-dmin" " real" " 0 "
175 Minimum density in output
177 .BI "-dmax" " real" " 0 "
178 Maximum density in output (0 means calculate it)