MATLAB: Usage of idmodel in simulink

idmodelsimulinkSystem Identification Toolbox

I would try a model predictive controller in simulink for a 4-input-single-output system, which is described by an idss model. the focus of the model is 100-step prediction. How should I introduce this model into simulink? I found the block of "idmodel" in system identification tool box. But I am not clear of the format of its input and output. Shall I use an iddata as the input or 4 input vectors?

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I don't have any experience with the System Identification Toolbox, but after looking at the documentation, it appears that you need to use IDDATA Source/Sink blocks for the input/output of the IDMODEL block. See Building the Simulink Model for more information.

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MATLAB: Does the output of the System Identification Toolbox model IDMODEL not match the output of the IDDATA object when I transfer these models into Simulink

This change has been incorporated into the documentation in Release 2011a (R2011a). For previous releases, read below for any additional information:

When transferring the estimated model to Simulink, it is not reasonable to expect that the model output would match the experimental data output, unless the correct initial states are specified. See the attached article for a description of this requirement and how to fulfill it. Basically, an estimate of the initial states must be obtained and inserted into the model block. This estimate may be obtained by using the function PE on the simulation data object.

See the attached model and MATLAB file for an example.

MATLAB: Delimiter usage

It seems to be impossible to use two-spaces-delimiter. You can try make your own dlmwrite function by edit the original. Try

>> open dlmwrite

-> modifications -> save as mydlmwrite

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MATLAB: Does the output of the System Identification Toolbox model IDMODEL not match the output of the IDDATA object when I transfer these models into Simulink

MATLAB: Delimiter usage

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