Using handle graphics for more global variables

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

Answer 1

[Matt Fig]

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.

Answer 2

[Fangjun Jiang]

How can I share data bgetween callback functions in my GUI

Answer 3

[Eric]

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