# set terminal pngcairo transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 # set output 'surface1.15.png' set dummy u,v set label 1 "This is equal to 1" at -5, -2, 1.5 centre norotate back nopoint offset character 0, 0, 0 set arrow 1 from -5, -2.1, 1.4 to 0, 0, 1 head back nofilled linetype -1 linewidth 1.000 set view 70, 20, 1, 1 set samples 51, 51 set isosamples 21, 21 set ztics -1.00000,0.25,1.00000 norangelimit set title "Sinc function" set xlabel "X axis" set xlabel offset character -3, -2, 0 font "" textcolor lt -1 norotate set xrange [ -1.00000 : 1.00000 ] noreverse nowriteback set ylabel "Y axis" set ylabel offset character 3, -2, 0 font "" textcolor lt -1 rotate by -270 set yrange [ -1.00000 : 1.00000 ] noreverse nowriteback set zlabel "Z axis" set zlabel offset character -5, 0, 0 font "" textcolor lt -1 norotate set zrange [ -0.500000 : 1.00000 ] noreverse nowriteback 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)" splot [-12:12.01] [-12:12.01] sinc(u,v)