25 setxunit
7.5 setborder
90 setangle_repere
-3 10 setxrange
-6 10 setyrange
/quadrillagegray 0.4 def
1 setquadrillagexstep
1 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
/f {setxvar
#rpn#   x^2
} def
/g {setxvar
#rpn#   x-3
} def
/h {setxvar
#rpn#   x^2+x-3
} def
gsave
   vert
   1.75 setlinewidth
   continu
   {h} courbe
grestore

gsave
   bleu
   .75 setlinewidth
   continu
   {f} courbe
grestore
gsave
   rouge
   .75 setlinewidth
   continu
 xmin .01 neg  {g} Courbe
 .01 xmax  {g} Courbe
grestore

 
<tex>
$\vec \imath $
</tex>
.4 -.1 [1.5 dup] dctexlabel

<tex>
$\vec \jmath $ 
</tex>
-.1 .2 [1.5 dup] ultexlabel

bleu

<tex>
$y=x^2$
</tex>
0.3 8 [1.5 1.5] urtexlabel

rouge

<tex>
$y=x-3$
</tex>
6 6 [1.5 1.5] drtexlabel
vert
<tex>
$y=x^2+x-3$
</tex>
1 2 [1.5 1.5] drtexlabel