How to access data of an iddata object in a cell array?

Question

Benjamin Pommer 2022-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/1871312-how-to-access-data-of-an-iddata-object-in-a-cell-array

评论： Star Strider 2022-12-5

Dear Matlab community!

I have a cell array where I store iddata objects with input signals and output signals. How can I inquire the input variable of the iddata object inside the cell array?

Best regards

Benjamin

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Answer 1

Star Strider 2022-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/1871312-how-to-access-data-of-an-iddata-object-in-a-cell-array#answer_1120277

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The iddata object is a structure, so in this instance, use cell array indexing and structure referencing to get its contents —

Fs = 500;
L = 50;
t = linspace(0, L-1, L).'/Fs;
u = [0 ones(1,L-1)].';
sys = tf([1 0], [1 0 1], 1/Fs);
y = lsim(sys, u, t);
% figure
% plot(t, y)
% hold on
% plot(t, u)
% hold off
% grid
k = 1;
data{k} = iddata(y, u, 1/Fs)
data = 1×1 cell array
    {50×1×1 iddata}
Input = data{k}.InputData                               % Return Input Data From Cell Array Of 'iddata' Objects
Input = 50×1
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