f(x) = (x <0.5 ? 2*x : 2-2*x)
plot [0:1] f(x)
pause -1 "Hit return"
plot [0:1] f(f(x))
pause -1 "Hit return"
plot [0:1] f(f(f(x)))
pause -1 "Hit return"
plot [0:1] f(x)/2+f(f(x))/4+f(f(f(x)))/8