How to call input of Matlab GUI P code from script?

Hi all;

Hope your help regarding calling the input of Matlab GUI P file from Matlab script. For example, I have a matlab GUI p file for simple calculation C = A+B with file name of calculate_GUI.p. When I run this file, its input A and B must be written from keyboard. I think to call the input from Matlab script file, for example calculate_GUI(A,B). Is it not possible?

Thanks for help EK