Data across GUI, Matlab - matlab

Question

So i tried to share GUI data using setappdata and getappadata. for example lets consider this
matfile1.m
h = EmotivEEG;
h.Run
for k = 1:4
out(:,:,k) = h.data + rand(1);
setappdata(0,'eegData', out(:,:,k);
pause(0.5);
end
h.delete
so the above file creates a 128x14 matrix every o.5 seconds and store it in eegData
matfile2.m
some_var = getappdata(0,'eegData')
plot(some_var)
this seems to work but not while in the loop, if i ask it to plot it i get this error
Error using setappdata
Too many output arguments.
Error in eeg_live>eeg_live_OpeningFcn (line 83)
lmno = setappdata(0,'eegData');
Error in gui_mainfcn (line 221)
feval(gui_State.gui_OpeningFcn, gui_hFigure, [], guidata(gui_hFigure), varargin{:});
Error in eeg_live (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in Neucube>activation_Callback (line 3963)
eeg_live
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in Neucube (line 49)
gui_mainfcn(gui_State, varargin{:});
Error in #(hObject,eventdata)Neucube('activation_Callback',hObject,eventdata,guidata(hObject))
Error using pause
Error while evaluating uicontrol Callback
any idea on how to tackle this problem.
thanks in advance.

Answer 1

There seems to be some problems with your code, but the line that MATLAB tells you generates the error is not in the snippet you provided, and the message is quite clear:
Using this command (line 83):
lmno = setappdata(0,'eegData');
is forbidden because setappdata does NOT accept output arguments, therefore the error is thrown. You can only use an assignment with getappdata.
Other points to consider:
1) Make sure you use the same variable name with get/setappdata (i.e. either eegdata or eegData...it might be a typo though)
2) You don't seem to call the 2nd script in your loop, so setappdata is overwriting the value of eegData at every iteration.
Hope that helps!