Présentation de 7967.jps

25 setxunit
7.5 setborder
90 setangle_repere
  setxrange
  setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
/R {settvar
#rpn#   Exp(-23t)
} def
-4 4 settrange
gsave
   .75 setlinewidth
   continu
   bleu
   (R) courbepolar
grestore