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From: Borer on 2 Feb 2010 19:48
Hello, everyone out there!
The "problem" with the data being deleted when closing the figure also happened to me. I tried several techniques, like calling the output callback in the CloseRequest callback. But nothing worked!! It appears that the function gui_mainfcn() deletes the data before assigning the output to varargout.... (This happens in the following section of the M-file of the GUI)

if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end


After thinking quite a while I found a workaround to fix this problem.
->Create a CloseRequestFcn Callback
Don't delete the figure there!!!! Just do a uiresume(handle)!!!!

->In the OutputFcn, assign your outputs you need and at last do the delete(hObject) which will close the GUI.

In this way the "gui_mainfcn" will call the output function which will delete the figure after assigning the outputs.

I hope this helps.
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