Présentation de 2617.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
/R {settvar
#rpn#   1/Sin(t/2)
} def
 3 neg 6  settrange
gsave
   .75 setlinewidth
   continu
   bleu
   (R) courbepolar
grestore