# set terminal png transparent nocrop enhanced font arial 8 size 420,320 # set output 'pm3d.41.png' unset border unset key set view map set samples 4, 4 set isosamples 4, 4 set size ratio 0 0.333333,0.333333 set origin 0.333333,0.333333 set noxtics set noytics set ztics border in scale 2,1 nomirror norotate offset character 0, 0, 0 autofreq set cbtics border in scale 2,1 mirror norotate offset character 0, 0, 0 autofreq set title "Original grid points" set xrange [ 0.00000 : 3.00000 ] noreverse nowriteback set yrange [ 0.00000 : 3.00000 ] noreverse nowriteback set cbrange [ 0.00000 : 9.00000 ] noreverse nowriteback set pm3d explicit at b set pm3d interpolate 1,1 flush begin noftriangles nohidden3d corners2color median unset colorbox sinc(u,v) = sin(sqrt(u**2+v**2)) /sqrt(u**2+v**2) f(x,y)=2*x+y dx = 0.333333333333333 dy = 0.333333333333333 splot f(x,y) with linesp ps 3 pt 5 palette