n=16
circum = 7.112*2*pi
length=circum/n
do for [i=1:n]{
y(i]=amp*cos(2*pi/n*i
set object rect i from y[i]-length/2,0.1 to y[i]+length/2,-0.1
}
set xrange [0:circum]
set yrange [-5.:5.]
plot