% Chapter 13: Figure 13.43
%
%   The continous step response of the second-order 
%   system of Figure 13.16, where
%
%                1
%     G(s) =  -------- .
%              s(s+1)
%
numg=[1]; deng=[1 1 0]; sysg=tf(numg,deng);
%
[nd,dd]=pade(1,2); sysp=tf(nd,dd);
sysi=tf([1],[1 0]);
sys1=series(1-sysp,sysi);
%
syso=series(sys1,sysg);
sys=feedback(syso,[1]);
t=[0:0.1:20];
step(sys,t)