Changing variables in a simulation program with matlab

I made a matlab connection with the simulation program (UniSim). I need to change the variable via Matlab and make this change in the simulation program. Which matlab command should I do this with?

[Saurav]

Hey, Gaye Yildiz,

I understand that you want to make changes to the variables used inside your UniSim program directly using the MATLAB commands.

Could you please specify the MATLAB interface you have used for communicating with your UniSim program? The exact command or function to change the variables would depend on the type of interface or connection you have established with UniSim.