Adventures in Computational Chemistry

GNUPLOT can be used to generate histograms. The script below allows one to plot variations in angle from 0° to 180°. Each histogram box width correspond to 3° (covered here under bw option). To execute this script; type this in the terminal: gnuplot histogram.p You should be in the folder where below script is saved in a file name "histogram.p" and a dat file (here, it is N---H-O.dat) should be present. histogram.p ------------------ set term gif set output "angle_N---H-O.gif" set xrange [0.0:180.0] set boxwidth 2.0 absolute set style fill solid 1.0 border -1 set xtics 10 set title "molecule 3.0A Angle N---H-O" set ylabel "occurance" set xlabel "angle" bw = 3   # substitute what you want bin(x,width)=width*floor(x/width) plot 'N---H-O.dat' using (bin($2,bw)):(1.0) smooth freq with boxes ------------------ The dat file is an input file with data in the format: 0    23.680344 1    73.766251 2    67.4