# set terminal pngcairo transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 # set output 'heatmap_4D.1.png' set format cb "%4.1f" set label 1 "z" at graph 0, 0, 1.1 left norotate back nopoint set view 49, 28, 1, 1.48 set samples 50, 50 set isosamples 50, 50 set style data lines set xyplane relative 0 set cbtics border in scale 0,0 mirror norotate autojustify set title "4D data (3D Heat Map)\nIndependent value color-mapped onto 3D surface" set title offset character 0, 1, 0 font "" textcolor lt -1 norotate set urange [ 5.00000 : 35.0000 ] noreverse nowriteback set vrange [ 5.00000 : 35.0000 ] noreverse nowriteback set xlabel "x" set xlabel offset character 3, 0, 0 font "" textcolor lt -1 norotate set xrange [ * : * ] noreverse writeback set x2range [ * : * ] noreverse writeback set ylabel "y" set ylabel offset character -5, 0, 0 font "" textcolor lt -1 rotate set yrange [ * : * ] noreverse writeback set y2range [ * : * ] noreverse writeback set zrange [ * : * ] noreverse writeback set cbrange [ * : * ] noreverse writeback set rrange [ * : * ] noreverse writeback set pm3d implicit at s set colorbox user set colorbox vertical origin screen 0.9, 0.2 size screen 0.03, 0.6 front noinvert noborder sinc(x,y) = sin(sqrt((x-20.)**2+(y-20.)**2))/sqrt((x-20.)**2+(y-20.)**2) Z(x,y) = 100. * (sinc(x,y) + 1.5) color(x,y) = 10. * (1.1 + sin((x-20.)/5.)*cos((y-20.)/10.)) NO_ANIMATION = 1 ## Last datafile plotted: "++" splot '++' using 1:2:(Z($1,$2)):(color($1,$2)) with pm3d title "4 data columns x/y/z/color"