History of Gnuplot-Tips (Open) (No. 1)

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  • 1 (2009-10-30 (Fri) 15:28:29)
  • 2 (2009-10-30 (Fri) 16:15:06)

[by Tareque and Nugraha, 2009.10.30]

How to plot contour using gnuplot†

Contour plot can be made with gnuplot, e.g., for the case of z = f(x,y). Electronic dispersion of a two dimensional graphite plane (graphene) is a good example of a contour plot. See the equations in Saito-sensei's CNT book. A general way to plot contour is by taking the data (*.dat) file format (e.g. graphene.dat).

Script:†

• Please set your own x,y range and x,y label

  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 

• To make the surface square:

  gnuplot> set size 0.721,1 
  gnuplot> replot 

• Saving the gnuplot figure:
  • in png format

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

  • in eps format

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

  • in pdf format
    • we must use eps as an input

      flex> epstopdf graphene.eps

    • the output will be graphene.pdf