[Jprogramming] Challenge 8 A Shamrock for St. Patrick

[Boyko Bantchev]

FWIW, the cleanest mathematical / programmable trefoil that
I know of is the following (I am too lazy to do it in J, so Gnuplot):

set size ratio 1.08
set parametric
set polar
plot [0:2*pi] t,1+cos(3*t)+sin(3*t)**2