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How to change C and D matrices of a state-space model?

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Dino
Dino on 26 May 2021
Commented: Jesús Zambrano on 27 May 2021
Hi,
I created a state-space model with the Simulink Linearization Manager and would like to derive a model with fewer outputs. So far, however, my approaches have only led to errors:
A = eye(3);
B = ones(3,1);
C = [1 0 0; 0 1 0];
D = [0; 0];
sys1 = ss(A, B, C, D, ...
'StateName', {'S1', 'S2', 'S3'}, ...
'OutputName', {'O1', 'O2'});
sys2_C = [1 0 0];
sys2_D = 0;
sys2 = sys1;
%sys2.C = sys2_C;
% Error: The "C" and "D" matrices must have the same number of rows.
sys2 = ss(A, B, sys2_C, sys2_D, sys1);
% Error: Property "OutputName" must specify one name per output channel.
Is there an elegant way to create sys2 while keeping the properties (such as StateName) of sys1?

Accepted Answer

Jesús Zambrano
Jesús Zambrano on 26 May 2021
What about:
sys2 = ss(A, B, sys2_C, sys2_D, 'StateName', sys1.StateName)
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