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Using handle graphics for more global variables

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William
William 2011-6-21
Can I modify the handles graphics in the GUI to store variables that I can than use globally? I need to pass variables in and out of functions in a GUI and am having problems.
Thanks

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Matt Fig
Matt Fig 2011-6-21
G = guidata(gcbf); % Get the application data
G.newvariable = 5; % Store new variables in this data.
G.newvariable2 = magic(3);
guidata(gcbf,G) % Now make the new variables available to other callbacks.

更多回答（2 个）

Fangjun Jiang
Fangjun Jiang 2011-6-21
Eric
Eric 2011-6-21
handles is a structure that you can modify, as Matt points out above. His variable G is the handles structure that you're likely referencing in your question.
I prefer to use appdata rather than guidata. See the help for getappdata() and setappdata(). I think it's largely a matter of personal preference. For data that are used by most callbacks, using guidata might be more efficient from a coding point-of-view. For storing large arrays that are only used by a few callbacks, using appdata might be more memory efficient.
Regardless of which method you choose, you should make sure and document your code well. Keep a list of fields you add to the handles structure or appdata variables you define.
Good luck, Eric

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