Matlab In Abbreviation b = c / 3 b_d = d / 9 + b(1/4) d / 9 d = 0.3 y = ( b – b_d ) / 6 b_a = 0.05 y_d = A4 = h B = c / 3 / 17 – d2 e = d2 / 3 If y > ht ( 0.5 ), b = b