This example shows how to set the initial states for simulating a model such that the simulation provides a best fit to measured input-output data.
To simulate the model using input
x0(:,2) as the initial states.
x0(:,2) is computed to maximize the fit between the measured output,
y2, and the response of
To compute initial states that maximizes the fit to the corresponding
y2, and simulate the model using the second
Extract the initial states that correspond to the second experiment for simulation.
X0est = x0(:,2);
Open the System Identification Toolbox™ library by typing the following command at the MATLAB® prompt.
Open a new Simulink® model window. Then, drag
and drop an
Idmodel block from the library into
the model window.
Open the Function Block Parameters dialog box by double-clicking
Idmodel block. Specify the following block
In the Model variable field, type
M to specify the estimated model.
In the Initial state field, type
X0est to specify the estimated initial
states. Click OK.
Drag and drop an
Iddata Source block
into the model window. Then, configure the model, as shown in the
Simulate the model for 2 seconds, and compare the
ysim with the measured output
ymeasured using the Scope block.