How to write a subfunction inside a GUI function?
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Walter Roberson on 28 May 2023
Yes, it is possible.
In the case of App Designer you might have to define the function in a separate .m file if it is not a callback function and is not part of a constructor or method.
If you are using App Designer, it is not clear there is any point in using a global variable instead of a property of the class -- not unless, perhaps, you are working with multiple apps and wanting to communicate between them.
We recommend against using global variables in most cases; they are the slowest form of shared variable, and the more error-prone.