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Error when using inv on system identification object

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Lars Wadsö
Lars Wadsö 2023-8-14
评论： Lars Wadsö 2023-8-23
In the code below an ARX410 model is created with iddata and arx and some random data. When I try to invert the model I get the following error message: "Error using inv. Invalid data type. Input matrix must be double or single". What is the problem?
Ts=1;t=(0:100)'; %time
u=sqrt(t/300); %in-data
y=sqrt(t/600)+randn(size(t))/50; %out-data
figure(1);clf;hold on;plot(t,u,'.',t,y,'.');hold off %plotting u and y
S=iddata(y,u,Ts); %generate a data object
sys=arx(S,[4 1 0]); %generate a model object
invsys=inv(sys); %invert the model

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回答（1 个）

Tianyu
Tianyu 2023-8-20
Hi Lars,
I suspect that you do not have correct "inv" function on the path. When you type
>> which -all inv
in the command line, you should be able to find the following function on the path
MATLAB\R2023a\toolbox\shared\controllib\engine\+ltipack\@ssdata\inv.m
this is the "inv" function used to invert the model.
Manually add it should resolve the issue.
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Lars Wadsö
Lars Wadsö 2023-8-23
Thanks. That solved my problem (I had recently installed a new version of MATLAB and the paths were not set correctly)

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