MATLAB: How to store your outputs of your step response

outputsplotstep

A = [0 0 1 0;0 0 0 1;-24 9 -3 0;4.5 -4.5 0 0]; B=[0 0;0 0;12 4;0 3.5]; C = [0 0 1 0;0 0 -3 0]; D = [0 0;0 0];
step(A,B,C,D)
how can i store the outputs of this step response so i can plot them together on a separate plot?

Best Answer

A = [0 0 1 0;0 0 0 1;-24 9 -3 0;4.5 -4.5 0 0];
B=[0 0;0 0;12 4;0 3.5];
C = [0 0 1 0;0 0 -3 0];
D = [0 0;0 0];
s=ss(A,B,C,D)
[y,t]=step(s)  % t is time vector
% output1 from input1
y11=y(:,1,1)
% output2 from input1
y21=y(:,2,1)
% output1 from input2
y12=y(:,1,2)
% output2 from input2
y22=y(:,2,2)
subplot(2,1,1)
plotyy(t,y11,t,y12)
title('output 1 & 2 from input 1')
subplot(2,1,2)
plotyy(t,y21,t,y22)
title('output 1 & 2 from input 2')
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