Undefined function or variable ... Error while evaluating uicontrol Callback

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Hamid
Hamid on 2 Dec 2015
Commented: Hamid on 2 Dec 2015
Hi everyone, I'm using GUI tool.
I'm going to enter my inputs from menu but I got this error :
??? Undefined function or variable 'I'.
Error in ==> GUI_2>Calculate_Callback at 379
A=I/sqrt(((TCAP*10^-4)/(tc*ar*pr))*log((k0+Tm)/(k0+Ta)));
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> GUI_2 at 42
gui_mainfcn(gui_State, varargin{:});
Error in ==> @(hObject,eventdata)GUI_2('Calculate_Callback',hObject,eventdata,guidata(hObject))
??? Error using ==> drawnow
Error while evaluating uicontrol Callback
this is my code (short version) :
...
function Untitled_1_Callback(hObject, eventdata, handles)
% hObject handle to Untitled_1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
prompt = {'rms symmetrical line to ground fault current in kA:'};
title = 'Ground Grid Inputs';
lines = 0.8;
def = {''};
options.Resize='on';
options.WindowStyle='normal';
options.Interpreter='tex';
answer=str2double(inputdlg(prompt,title,lines,def,options));
I=answer(1);
...
% --- Executes on button press in Calculate.
function Calculate_Callback(hObject, eventdata, handles)
A=I/sqrt(((TCAP*10^-4)/(tc*ar*pr))*log((k0+Tm)/(k0+Ta)));
WHAT SHOULD I DO??
pleaseeeeeeeeeee
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Accepted Answer

Adam
Adam on 2 Dec 2015
handles.I = answer(1);
guidata( hObject, handles );
in your first callback and
I = handles.I;
at the start of your second callback will fix this in a simple way, but I strongly advise you to read up on this, following the links Stephen suggested. Using guidata is very easy when you are used to it and actually understand it, but it also has pitfalls if you simply copy examples of it without properly understanding what it is doing and why.

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