gnuplot> set hidden gnuplot> set isosam 50 gnuplot> splot sin(x*x + y*y)/(x*x + y*y) gnuplot> splot [-3:3] [-3:3] sin(x*x + y*y)/(x*x + y*y) gnuplot> splot [-4:4] [-4:4] sin(x*x + y*y)/(x*x + y*y) gnuplot> set title "Gnuplot 3D graph" gnuplot> replot gnuplot> set grid gnuplot> replot gnuplot> set xlabel gnuplot> set xlabel "X" gnuplot> set ylabel "Y" gnuplot> set zlabel "Z" gnuplot> replot