How to write a subfunction inside a GUI function?

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Merse Gaspar 2023-5-28

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https://ww2.mathworks.cn/matlabcentral/answers/1974684-how-to-write-a-subfunction-inside-a-gui-function

编辑： Merse Gaspar 2023-5-29

I Would like to write a subfunction or subscript inside a GUI, but not a callback function, and I want to use any kind of global variables inside this function or subscript, or create new global variables in it. Is it possible?

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Answer 1

Walter Roberson 2023-5-28

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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.

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Walter Roberson 2023-5-28

When I search that document, I do not find any uses of global . Could you direct me to a specific page in the document that shows using global variables?

Are you looking at section 3, Create a Simple UI Programmatically ? If so then it does not use any global variables.

Merse Gaspar 2023-5-29

编辑：Merse Gaspar 2023-5-29

I apologise if I did not use the term correctly. In that example, the whole GUI is in a single file (in a main function), and what is defined in the main body of that function is what I call global.

So, as far as I see, it is possible to use variables defined outside a subfunction (with a note about nested functions), but I cannot define new ones inside a subfunction.

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