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

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Dino
Dino 2021년 5월 26일
댓글: Jesús Zambrano 2021년 5월 27일
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?

채택된 답변

Jesús Zambrano
Jesús Zambrano 2021년 5월 26일
What about:
sys2 = ss(A, B, sys2_C, sys2_D, 'StateName', sys1.StateName)
  댓글 수: 2
Dino
Dino 2021년 5월 27일
Sure, this way is fine for the given example. However, if more fields are set (StatePath, StateUnit, Ts, InputName etc.), it would become a bit messy. So I think I should wrap the whole thing into a function.
Jesús Zambrano
Jesús Zambrano 2021년 5월 27일
sure, and get access to all the elements of sys1.

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