# set terminal pngcairo transparent enhanced fontscale 1.0 size 600, 400 # set output 'piecewise.3.png' set border 16 front lt black linewidth 1.000 dashtype solid set key at screen 0.5, 0.15 center center vertical Right noreverse enhanced autotitle nobox set style increment default set style data lines set xyplane at 0 unset xtics unset ytics set title "Piecewise function of one parameter in 3D" set title font ",15" norotate set xrange [ * : * ] noreverse writeback set x2range [ * : * ] noreverse writeback set yrange [ * : * ] noreverse writeback set y2range [ * : * ] noreverse writeback set zrange [ * : * ] noreverse writeback set cbrange [ * : * ] noreverse writeback set rrange [ * : * ] noreverse writeback part1(x) = 0.5 + (9.*x-x**3)/ 24. part2(x) = 1.0 + (x-3.0)**3 / 48. save_encoding = "utf8" part1 = "part1: for x < 1 norm(x) ≈ ½ + (9x-x^3) / 24" part2 = "part2: for x > 1 norm(x) ≈ 1 + (x-3)^3 / 48" ## Last datafile plotted: "+" splot [-2:2][-2:2] sample [h=1:5] '+' using (cos(h)):(sin(h)):(h) lw 2, [h=5:10] '+' using (cos(h)):(sin(h)):(h) lw 4, [h=10:15] '+' using (cos(h)):(sin(h)):(h) lw 2