It seems that the functionality of accessing or finding the Jacobian matrix of a Simulink model is not available. However, there are a few possible workarounds that you could try and see if any of those meet your requirements:
- Write an S-Function in MATLAB that calculates the Jacobian. This usually involves numerical differentiation, where you perturb each state slightly and observe the change in outputs. Integrate this function with Simulink using the “s-function” block, by specifying the name of the MATLAB file corresponding to the S-Function. You can refer to the documentation of the “s-function” for more information: https://www.mathworks.com/help/releases/R2021a/simulink/s-function-basics-matlab.html
- Use the “jacobian” function of the “Symbolic Math toolbox” by manually coding the equations. To use this toolbox, you can create a separate MATLAB script and generate the Jacobian matrix in using the “jacobian” function. Then, this script can be added to the Simulink model by using the “MATLAB function” block. You can refer to the documentation of the function for more information: https://www.mathworks.com/help/releases/R2021a/symbolic/sym.jacobian.html
It is also possible to get the Solver Jacobian Pattern for a Simulink model. The Solver Profiler supports Jacobian logging and analysis, but only for models that use implicit solvers. You can refer to this link for more details: https://www.mathworks.com/help/releases/R2021a/simulink/slref/exploring-the-solver-jacobian-structure-of-a-model.html
I hope some of these workarounds are helpful to you.
