MATLAB: How to use the under knees code of state space model “ident” toolbox in mfile

MATLABsystem identificationSystem Identification Toolbox

Hi, all,

I am currently using "ident" toolbox. I got a good fitting result by using state space model from the GUI. However, I want to lunch the system identification from mfile. How can I call the model that I used in ident GUI? Or How can I get the under knees code of the state space model in ident toolbox that I can use in command line?

I tried N4sid, but I don't know the parameters or other setting that I used in ident GUI. The results from N4sid are much worse than that from ident GUI.

Can anybody help me to use the ident state space model in mfile?

Thanks very much.

Xiwang Li

Best Answer

Double click on estimated model icon. A window containing information on the model is shown. This window offers commands that will reproduce the GUI results.

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MATLAB: Use N4sid for system identification (for new data estimation)

Computing response of a model to a given input is called simulation. Use the idParametric/sim command for that as in:

 Ud = iddata([], U2, .2);
 Yd = sim(m, Ud);
 Y2 = Yd.y; % the raw response data

See:

http://www.mathworks.com/help/ident/ref/sim.html

http://www.mathworks.com/help/ident/ref/findstatesidparametric.html

MATLAB: Am I unable to export the data from the “ident” GUI of the System Identification Toolbox 6.0.1 (R14)

This bug has been fixed in Release 14 Service Pack 2 (R14SP2). For previous releases, please read below for any possible workarounds:

This has been verified as a bug in the System Identification Toolbox 6.0.1 (R14) in the way that the IDENT GUI handles data with spaces in the name, including trailing spaces. For example, this problem occurs when the data set is named:

 'My Data Set '

Note this data set has spaces between each of the words as well as a space at the end of the name. Since this is not a valid MATLAB variable, this error is produced.

Currently, to work around this issue, rename all data sets which contain spaces, or that would otherwise be invalid as MATLAB variables.

Best Answer

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MATLAB: Use N4sid for system identification (for new data estimation)

MATLAB: Am I unable to export the data from the “ident” GUI of the System Identification Toolbox 6.0.1 (R14)

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