How can I write an initialization values in simulink?

I'd like to write some values that are initialized once in the beginning in the program. The system is closed loop and there are equations depend on itself Ex.:

a= w*e+b;

b=f/a;

so we must write at the first, the values of ( w, e, and f) then the system will use the values which are being extracted from the simulink.

Answer 1

[Birdman]

You should write them to File->Model Properties->Model Properties->Callbacks->InitFcn.

[Ahmed Sayed]

I tried this before, but the problem is the simulink does not calculate the equations by using the new values, which are being extracted from the simulink

[Birdman]

Hmm, you need to operate that within Simulink itself, in the simulation.

[Ahmed Sayed]

yes, that is what I need.

[Birdman]

Ok, try something and ask specific questions. I am here.

[Ahmed Sayed]

Now the problem is: the simulink ran without any error, but it still does not use the new values, which are being extracted from the simulink