Given a transfer function, e.g.
numerator = [0, 1, 0, -.5] % s^2-0.5 = s^2 +0.5
denominator = [1, 1, 1, 1] % (s+1)(s^2+1) = s^3+ s^2+s+1
G1 = tf(numerator, denominator)
Is it possible to determine if this system is absolutely stable using the Popov criterion through the built-in popov function in Matlab?