Error when using inv on system identification object
7 views (last 30 days)
Show older comments
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
0 Comments
Answers (1)
Tianyu
on 20 Aug 2023
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.
See Also
Categories
Find more on Linear Model Identification in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!