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Download MATLAB SYSTEM IDENTIFICATION TOOLBOX 7 User`s guide
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Identifying State-Space Models Using the Model Order Selection Window You can generate the Model Order Selection window for your data to select the number of states that provide the highest relative contribution to the input-output behavior of the model (log of singular values of the covariance matrix). For a procedure on generating this plot in the System Identification Tool GUI, see “Estimating Model Order in the GUI” on page 3-79. To open this plot at the command line, see “Estimating the Model Order at the Command Line” on page 3-82. The following figure shows a sample Model Order Selection window. The horizontal axis corresponds to the model order n. The vertical axis, called Log of Singular values, shows the singular values of a covariance matrix constructed from the observed data. You use this plot to decide which states provide a significant relative contribution to the input-output behavior, and which states provide the 3-83
