-2.2 2.5 setxrange
-2.2 2.5 setyrange

%-2.2 2.2 setxrange
%-2.2 2.2 setyrange

50 setxunit
2 setymkstep
quadrillage
tracerepere
marks

1.2 setlinewidth
-2 2 {dup dup mul 3 sub mul} (*-*) Courbe

setTimesItalic
   (x) xmax 0 (3 0) dltext
   (y) 0 ymax drtext
<tex>
$\vec \imath $
</tex>
.5 0 [1.2 dup] dctexlabel
<tex>
$\vec \jmath $
</tex>
0 .5 [1.2 dup] cltexlabel