After you run the mex command on your c file, an executable file (.exe extenstion) should appear in your directory. To run this executable, you use the bang operator, or the exclamation mark. For example, if I ran the mex function on a file helloworld.c, a file helloworld.exe would show up in my directory. Then I would execute the following command:
>> !helloworld
Hello World!
The following documentation may be useful: https://www.mathworks.com/help/dsp/ug/generate-c-code-from-simulink-model.html Please note that this documentation is for the DSP system toolbox, so you may not be able to open the example models, but the information is still relevant to your workflow.
