Présentation de 7683.jps

25 setxunit
7.5 setborder
90 setangle_repere
-5 5 setxrange
-5 5 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
  0  2 pi mul settrange
/a 2 def
/h 0 def
/rho {
   Cos a mul h add
} def
/dessin {
{settvar t Cos t rho mul} {settvar t Sin t rho mul} courbeparam
} def
  1.75 setlinewidth
   continu
   bleu
   dessin
pointilles
/h 1 store
dessin
dotted
/h 2 store
dessin