History of GNUPLOT TIPS (open) (No. 2)

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  • 1 (2009-10-16 (Fri) 21:25:24)
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How to plot contour using GNU Plot†

Contour plot can be make for the case z=f(x,y) For example, Electronic dispersion of a two dimensional graphite plane ( graphene) can be a good example of a contour plot. for details please read the book 'Physical Properties of Carbon Nanotube' by R. Saito, G Dresselhaus, M S Dresselhaus (Imperial Press).

Gnuplot can make figure from dat ( example: graphene.dat) format file. following are the script to make a contour plot of Electronic dispersion of graphene

• gnuplot> set contour
• gnuplot> set dgrid3d 50,50,40
• gnuplot>set cntrparam levels 20
• gnuplot>unset surface
• gnuplot>unset key
• gnuplot>set xlabel 'kx'
• gnuplot>set ylabel 'ky'
• gnuplot>set xrange [-8:8]
• gnuplot>set yrange [-8:8]
• gnuplot>splot 'graphene.dat' with lines

please set your own x,y range and x,y label

to make the surface square

• gnuplot>set size 0.721,1
• gnuplot>replot

How to save the gnuplot figure

1. To save the figure in png format

• gnuplot>set term png
• gnuplot>set output 'graphene.png'
• gnuplot>replot

2. To save the figure in eps format

• gnuplot>set term postscript
• gnuplot>set output 'graphene.ps'
• gnuplot>replot

3. To save as pdf format

• Exit from the gnuplot terminal
• Go to the user terminal (example : chowdury@flex>)
• then chowdury@flex>epstopdf 'graphene.eps'

     
                (Tareque)