isminphase Checks given system function is Maximum-Phase system or not flag = ismaxphase(b,a) flag = ismaxphase(sos) flag = ismaxphase(...,tol) b Coefficients of numerator polynomial of system function a Coefficients of denumerator polynomial of system function sos Second order section matrix of order Kx6 tol Tolerence in similarities between two numbers in phase response flag This function returns logical 1 if system is minimum-phase system (flag = 1) Otherwise it returns logical 0 (flag = 0) This function determines whether the given system function is minimum-phase system or not . Minimum-phase system means all zeros of transfer function will be inside the unit circle in z-plane,also poles must be within unit circle for stability and causality Checking given system function is minimum phase system or not \begin{eqnarray} H(z) = 1 -0.3z^{-1} + 0.02 z^{-2} \end{eqnarray}