%%  Discrete-Time Description
%

sys = tf([0.04798 0.0464],[1 -1.81 0.9048],0.1);
P = pole(sys)%For stable discrete systems, 
% all their poles must have a magnitude strictly smaller than one,
% that is they must all lie inside the unit circle. 
% The poles in this example are a pair of complex conjugates, 
% and lie inside the unit circle. Hence, the system sys is stable. 