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% Example 3.13 
% 
a=[2.25, -5,  -1.25, -0.5;  2.25, -4.25, -1.25, -0.25; 
   0.25, -0.5,-1.25, -1;    1.25, -1.75, -0.25, -0.75]; 
b=[4,6; 2,4; 2,2; 0,2]; 
c=[0,0,0,1; 0,2,0,2]; 
d=zeros(2,2); 
figure(1) 
step(a,b,c,d) 
figure(2) 
impulse(a,b,c,d)