%% auteur : gh

-1 4 setxrange
-1 4 setyrange

/M {3 2} def
/O {0 0} def
/Mx {3 0} def
/My {0 2} def

.25 setlinewidth
quadrillage
.75 setlinewidth
tracerepere

[O M] points


<tex> 
$$
\vec{\imath }
$$ 
</tex> 
0.5 0  [1.5 1.5] dctexlabel 


<tex> 
$$
\vec{\jmath }
$$ 
</tex> 
0 0.5  [1.5 1.5] cltexlabel 
 

rouge
pointilles
1 setlinewidth

M Mx (-) line
M My (-) line

bleu
continu

O M (->) line

noir

16 setfontsize
setTimesItalic
   (M) M urtext
   (O) O dltext
   (x)  Mx dctext
   (y) My cltext
   (Plan affine) -0.9 -0.9 urtext