#! /usr/bin/gnuplot set title "Optimering af volumen 12*12 kvadrater" set term post enh set xrange [0:6] set yrange [-20:140] set xlabel "Tern" set ylabel "Volume tern³" set term png size 1000, 700 set output "tredje+andengradsligning.png" set grid set label "Skæringspunkt (2,0)" at 2,5 set label "Toppunkt (2,128)" at 2,130 set arrow from 1.2,90 to 1,100 set label "1 tern: 100 tern³" at 1.22,90 set arrow from 1.6,110 to 2,128 set label "2 tern: 128 tern³" at 1.5,105 set arrow from 2.7,90 to 3,108 set label "3 tern: 108 tern³" at 2.4,85 plot \ 4*x**3 - 48*x**2 + 144*x ti "4x³ - 48x² + 144x", \ 0 ti "x-akse", \ 12*x**2 - 96*x + 144 ti "12x² - 96x + 144"