30 setxunit
18 setfontsize
-1 11 setxrange
-8 4 setyrange

/f {
   ln
} def


/val 3.14 2 div def

%[1 1 .5 .5 .1 .1] {orange} Quadrillage
tracerepere
marks
gsave
   bleu
   1.75 setlinewidth
   .0001 xmax {f} Courbe
grestore

<tex>
$$
   y = \ln x
$$
</tex>

/dx_boxit 2 def
/dy_boxit 2 def
%/fillstyle {jaune fill} def
/linearc .05 def
boxit
3 -2 [2 dup] cctexlabel