F4 - Quarter function with noise 30 0 -1.5 1.5 1 -1.5 1.5 2 -1.5 1.5 3 -1.5 1.5 4 -1.5 1.5 5 -1.5 1.5 6 -1.5 1.5 7 -1.5 1.5 8 -1.5 1.5 9 -1.5 1.5 10 -1.5 1.5 11 -1.5 1.5 12 -1.5 1.5 13 -1.5 1.5 14 -1.5 1.5 15 -1.5 1.5 16 -1.5 1.5 17 -1.5 1.5 18 -1.5 1.5 19 -1.5 1.5 20 -1.5 1.5 21 -1.5 1.5 22 -1.5 1.5 23 -1.5 1.5 24 -1.5 1.5 25 -1.5 1.5 26 -1.5 1.5 27 -1.5 1.5 28 -1.5 1.5 29 -1.5 1.5 true 0 29 i i 1 i 0 1