How can I use quadprog in Simulink?

Hello everyone,

I am using quadprog in a MatLab function in Simulink. When I run the simulation, I get the following error "Function 'quadprog' not supported for code generation". My purpose is running a simulation and interpreting the results, I don't want to generate any code from the model.

Any suggestions on how I can solve this issue?

Thanks in advance.

Answer 1

[Saleh Msaddi]

It appeared that most of the Optimization Toolbox functions supported with Embedded MATLAB, and quadprog is one of these upsupported functions. Since I am not interested in code generation, I figured out that I can use the following command in my function block, and it works perfectly!

coder.extrinsic('quadprog');

[weiwei cao]

Thanks a lot, I have the same problem when i use the quadprog function in matlab function.

[Saleh Msaddi]

You're welcome! :)

[Syed Ahmad Nadeem]

Thank you for the information Saleh. I tried using the code you mentioned above to work with the quadprog function in matlab embedded function. On using it I a receive another set of errors as:

'inner matrix dimensions must agree'

Simulink cannot determine sizes and/or types of the outputs for block 'linear_model_check/MPC controller' due to errors in the block body, or limitations of the underlying analysis. The errors might be inaccurate. Fix the indicated errors, or explicitly specify sizes and/or types for all block outputs.

I tried exploring these errors further and it seems these generate from the command statement where I try to assign the outputs of 'quadprog' function to some variable name. If you could point in some direction, it would be really helpful. I am using Matllab 2018a, and trying to avoid the upgradation to 2020a.

[Saleh Msaddi]

Dear Syed, try using the signal speicifer to specify the quadprog output signal properties. Check https://www.mathworks.com/help/simulink/slref/signalspecification.html

Regards

Answer 2

[Mary Fenelon]

Code generation support for quadprog was added in R2020a.

[Saleh Msaddi]

Thank you for the information. I will update my MATLAB

[li gu]

I want to ask why I upgrade matlab to 2020, but still report an error to show that this function cannot generate code?

[Saleh Msaddi]

Use the following function in the first beginning of your MATLAB Function,

coder.extrinsic('quadprog');

Also, make sure to use a "signal specification" block to specify the dimenasion of the signal produced by the quadprog function