Présentation de 1891.jps

25 setxunit
7.5 setborder
90 setangle_repere
-50 50 setxrange
-50 50 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
.75 setlinewidth
continu
bleu
/X {settvar
#rpn#   t^(3) + 3t^(2) - 9t
} def
/Y {settvar
#rpn#   t^(3) - 3t^(2) - 9t
} def
 0 pi  {X} {Y} Courbeparam