MATLAB: What methods do you use to bring the variable data from an external program or function into a guide GUI function file

Question

Pleae share the way you manage to bring the variables(which are updated in the external program/functions)from external program/functions into a matlab gui functions.

[Meaning the GUI function is defined in a seperate file and your main function is written in another file.]

Answer 1

1. Load required parameter into Matlab (base) workspace
2. Use evalin() to load the specified parameter into the GUI.