# set terminal pngcairo background "#ffffff" enhanced font "arial,10" fontscale 1.0 size 600, 400 # set output 'polar.3.png' set clip points unset border set dummy t,y set key inside right top vertical Right noreverse enhanced autotitles box linetype -1 linewidth 1.000 set polar set samples 160, 160 set style data lines set xzeroaxis linetype 0 linewidth 1.000 set yzeroaxis linetype 0 linewidth 1.000 set zzeroaxis linetype 0 linewidth 1.000 set xtics axis in scale 1,0.5 nomirror norotate offset character 0, 0, 0 autojustify set ytics axis in scale 1,0.5 nomirror norotate offset character 0, 0, 0 autojustify set nortics set trange [ 0.00000 : 6.28319 ] noreverse nowriteback plot 2*sqrt(cos(t)),-2*sqrt(cos(t))