25 setxunit 7.5 setborder 90 setangle_repere -1 1 setxrange -2 1 setyrange 1 1 settkstep .5 .5 setsubtkstep 2 2 setmkstep ticks subticks marks traceaxes axesarrow .75 setlinewidth continu noir /X {settvar #rpn# Sin (t) ^ 3 } def /Y {settvar #rpn# Cos (t) - Cos (t) ^4 } def 0 2 pi mul {X} {Y} Courbeparam