fsolve in simulink model

hallo, i'm a beginner to matlab and i would appreciate your help.

matlab is showing an error at

   The function 'fsolve' is not supported for standalone code generation. See    the documentation for coder.extrinsic to learn how you can use this function in simulation.

does this suggest that fsolve can't be used in simulink? are there other options, that would do a similar job and that can be used in simulink? i tried different modifications, but it didn't seem to help.

can anyone help me? best regards

Answer 1

[Kaustubha Govind]

Perhaps the (Embedded) MATLAB Function block is not right for you, because FSOLVE is not supported for code-generation. If you're familiar with writing S-functions, writing a Level-2 MATLAB-file S-function might be better.

If you have to use this block, I would create a separate function on the MATLAB path that calls into FSOLVE and performs other operations unsupported for code-generation and call it from the (Embedded) MATLAB Function block using the code.extrinsic directive.

[Bharat]

is there any other way apart from creating S-Functions that i could go about to use fsolve and get code generation?

[Anan Yaghmour]

you can use the MATLAB interpreted FCN block, and you don't need to implement the S-function for fsolve.

[Amal Aljasmi]

@Kaustubha Govind, Interpreted Fcn block works while running the model but causes an error when you try to compile it. Is there any way to use fsolve in Simulink and also be able to compile it later? Thanks

[Walter Roberson]

These days, code generation is supported for fsolve; https://www.mathworks.com/help/optim/ug/fsolve.html#mw_c671c5b5-f1b5-48de-bd68-e8bfa764994b . This might, however, require licenses beyond what you are using now.

[Amal Aljasmi]

@Walter Roberson Thanks for a reply. Could you please clarify, to generate code for fsolve in Simulink we can use Interpreted MATLAB Fcn, as mentioned here https://uk.mathworks.com/matlabcentral/fileexchange/61633-fsolve-matlab-simulink-example , or MATLAB Function? Also, could you please provide a simple example of integration fsolve function in Simulink that's supported for later compiling. Thanks in advance.

[Walter Roberson]

I have not done it myself, and I do not know if it can be done in any "simple" way. But it should at least be possible now.

It could potentially require putting in coder.ceval() statements to call routines that you generated code for using MATLAB Coder. Or perhaps there are easier ways.

I have rarely had reason to generate code from Simulink (and never on Windows), so I am fairly rusty on the practical details.

Answer 2

[T Bui]

I think this would be helpful

https://uk.mathworks.com/matlabcentral/fileexchange/61633-fsolve-matlab-simulink-example

Cheers