# set terminal pngcairo transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 # set output 'surface1.20.png' set dummy u,v set parametric set view 70, 20, 1, 1 set samples 51, 51 set isosamples 20, 20 set style data lines set ticslevel 0 set title "Data grid plotting" set xlabel "X axis" set xlabel offset character -3, -2, 0 font "" textcolor lt -1 norotate set ylabel "Y axis" set ylabel offset character 3, -2, 0 font "" textcolor lt -1 rotate by -270 set zlabel "Z axis" set zlabel offset character -5, 0, 0 font "" textcolor lt -1 norotate sinc(u,v) = sin(sqrt(u**2+v**2)) / sqrt(u**2+v**2) GPFUN_sinc = "sinc(u,v) = sin(sqrt(u**2+v**2)) / sqrt(u**2+v**2)" xx = 6.08888888888889 dx = 1.11 x0 = -5 x1 = -3.89111111111111 x2 = -2.78222222222222 x3 = -1.67333333333333 x4 = -0.564444444444444 x5 = 0.544444444444445 x6 = 1.65333333333333 x7 = 2.76222222222222 x8 = 3.87111111111111 x9 = 4.98 xmin = -4.99 xmax = 5 n = 10 zbase = -1 splot "glass.dat" using 3:2:1