Learn more about System Identification Toolbox

After Estimating Grey-Box Models

After estimating linear and nonlinear grey-box models, you can simulate the model output using the sim command. For more information, see Overview of Model Validation and Plots.

The toolbox represents linear grey-box models using the idgrey model object. To convert grey-box models to state-space form, use the idss command, as described in Transforming Between Linear Model Representations. You can then analyze the model behavior using transient- and frequency-response plots and other linear analysis plots.

The toolbox represents nonlinear grey-box models as idnlgrey model objects. These model objects store the parameter values resulting from the estimation. You can access these parameters from the model objects to use these variables in computation in the MATLAB workspace.

Note   Linearization of nonlinear grey-box models is not supported.

You can import grey box models into a Simulink model using the System Identification Toolbox Block Library. For more information, see Simulating Model Output.

Estimating Nonlinear Grey-Box Models

Time Series Identification

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