How to use LQR and code generation?

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Joschua on 4 Dec 2013
Commented: Victory Friday on 21 Jan 2022
I'm trying to generate C Code of a Simulink model, that contains an embedded Matlab function containing the Matlab LQR(A,B,Q,R,N) function.
But I recieve this error: "The function 'lqr' is not supported for standalone code generation."
I can not use code.extrinsic, because the target won't have MATLAB installed.
Is there a work-around?
  1 Comment
Ryan Livingston
Ryan Livingston on 13 Feb 2019
We've made an internal note of your request to support code generation for lqr so it can be considered for the future.

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Answers (2)

John Petersen
John Petersen on 29 May 2015
The 'work around' is to write your own Ricatti Eq Solver.
  1 Comment
Victory Friday
Victory Friday on 21 Jan 2022

Please can you help me with one

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Raj on 13 Feb 2019
Unfortunately there is not work around here. Coder.Extrinsic functions are not supported for code generation. Only call to there functions will come in your generated code. You will have to go to mathematics and write algorithm to solve the Algebraic Riccati Equation.
However, if your system is not time variant (i.e. LTI) systems, I would recommend computing the gain matrix separately and use the gain matrix directly in your model.

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