Dear Mahdi Nabipour

You can use Matlab Function Block.

I think this link will be helpful

https://www.mathworks.com/help/simulink/slref/matlabfunction.html

Best Regards

https://uk.mathworks.com/matlabcentral/answers/81902-how-to-run-matlab-function-and-simulink-model-simultaneously

https://uk.mathworks.com/matlabcentral/answers/56006-simultaneous-running-of-matlab-and-simulink

https://uk.mathworks.com/matlabcentral/answers/306662-how-can-i-run-a-script-written-in-the-editor-while-running-a-simulation-of-a-simulink-model-that-dep

https://stackoverflow.com/questions/17132847/how-to-run-simulink-simulation-and-matlab-script-simultaneously

You may follow answer to your query here for a similar question : https://au.mathworks.com/matlabcentral/answers/165119-how-can-i-run-a-m-file-with-simulink-model-in-the-same-time-and-this-m-file-takes-simulink-model-dat

https://www.researchgate.net/post/How_can_I_run_simulink_and_mfile_coordinated_in_matlab

Hello Mahdi Nabipour ,

According to the Simulink manual, you should avoid using the Matlab Function (Fcn) block in your Simulink model as it can drastically slow down your simulation because the Matlab interpreter has to be called at each time step. The manual recommends the built-in Fcn block or Math Function block if possible.

Regards,

Tom Cuff

Run Simulations Programmatically

You can programmatically simulate a model with the sim function, using various techniques to specify parameter values. In addition to simulating a model, you can use the sim to enable simulation timeouts, capture simulation errors, and access simulation metadata when your simulation is complete

https://www.mathworks.com/help/simulink/ug/using-the-sim-command.html#:~:text=The%20sim%20function%20returns%20SimOut,output%20signal%20values%20against%20time.

Dear Mahdi Nabipour , in simulink we can define custom function block by using matlab script that called "Matlab Function Block". inputs, outputs and any other function can be defined in a "Matlab Function Block".

see the link:

https://www.mathworks.com/help/simulink/ug/what-is-a-matlab-function-block.html

You can simply use 'Matlab Function Block' from Simulink Library.

From simulink library using (Matlab function block) or (Interpreted Matlab function block).

https://www.researchgate.net/deref/https%3A%2F%2Fwww.mathworks.com%2Fhelp%2Fsimulink%2Fug%2Fwhat-is-a-matlab-function-block.html

You can use MATLAB Function block in a Simulink. In the function block you can write your script.

Dear all,

Thanks for your responses. My Simulink is a model with a high computational time demand. My script is a controller that should be active in some cases and I know that using Matlab function in my case, as Thomas Cuff said, will impose more computational cost. But I think its the only option I have.

Thanks for all your comments.