25 setxunit
7.5 setborder
-2 7 setxrange
-5 5 setyrange
jpegmode
/a 2 def
/b 2 def
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
/R {settvar
#rpn# b + 2 * a * Cos (t)
} def
0 2 pi mul settrange
gsave
0.75 setlinewidth
continu
bleu
(R) courbepolar
grestore
|