Matlab Gui:如何在函数之间共享数据。

I'm new to this forum and to matlab GUIs. I have this problem. I wanted to create a GUI which allows you to load data from an xlsx file and then I'd like to compute a GARCH model with this data. The problem I have is that I don't know how to pass this data to the function GARCH.I'm new to this forum and to matlab GUIs. I hav