Making a button display a value in a message box

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Edwin Froelich
Edwin Froelich 2018-6-14
回答： Jan 2018-6-16
I have a button that produces a value and puts it in a listbox. I would like to add a new button that displays that value in a message box. Please help!
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Edwin Froelich
Edwin Froelich 2018-6-15
Hello Jan,
The value produced is a mean. One button calculates that mean and I would like to store that value and retrieve it on call from a different button. I tried declaring a global variable but matlab didn't like when I did that. I am working in guide but I am trying to edit the code part of it to pass the value around.

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Jan
Jan 2018-6-16
Global variables are a bad programming practice, which can cause serious troubles and which impede the debugging massively. Therefore it is recommended to avoid globals - not only in Matlab, but in other programming languages also.
You can store data inside a GUI, e.g. in the UserData of the figure or any object, or in the ApplicationData. The latter works e.g. with guidata:
function OpeningFcn(hObject, EventData, handles)
% Define a default value:
handles.MeanValue = 'undefined';
% Store updated struct in the figure's ApplicationData:
guidata(hObject, handles);
end
function button1_callback(hObject, EventData, handles)
% Update the field MeanValue in the handles struct:
handles.MeanValue = mean(handles.Data);
% Store updated struct in the figure's ApplicationData:
guidata(hObject, handles);
end
function button2_callback(hObject, EventData, handles)
disp(handles.MeanValue);
end

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