MATLAB: GUI: How do save data from one callback to another

Question

Hi i want to save my data from one callback and use that in other callback.

eg. i have 2 button, one to run the first callback and the other to run the second callback.

eg.

function a_Callback(hObject, eventdata, handles)

a = 2+2;

function c_Callback(hObject, eventdata, handles)

c = 2+a;

how do i save or use the " a=2+2 " from the first one to be saved to the next callback, so if i click on "button 2" it will give me eg. 6.

Answer 1

The handles structure that your callback receives is meant exactly for this:

%It's a good idea to create the variable used in the callback when the gui is first created. e.g. in the OpeningFcn callback
function mygui_OpeningFcn(hObject, eventdata, handles)
    handles.a = NaN;
    %...

end
    
function a_Callback(hObject, eventdata, handles)
    handles.a = 2+2;
    guidata(hObject, handles)  %save new state of handles
end
function c_Callback(hObject, eventdata, handles)
    c = 2 + handles.a;
    %...
end