set title "complexite de l'extraction des frequents"
set logscale
set style data lines
set xlabel 'support minimum'
set ylabel 'nombre de frequents'
set y2tics
set y2label 'temps extraction en s.'
plot '@file@' using 1:2 title 'nombre de frequents' axis x1y1, '@file@' using 1:3 title 'temps extraction' axis x1y2, '@file@' using 1:($2/$3) title 'rapport temps/frequent'