25 setxunit
7.5 setborder
-5 5 setxrange
-5 5 setyrange
jpegmode
/a 4 def
/k 7.3 def
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
/R {settvar
a k t mul Sin mul
} def
0 2 pi mul settrange
gsave
.75 setlinewidth
continu
bleu
(R) courbepolar
grestore
|