MATLAB GUI set handles text problem.

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Nimisha on 4 Apr 2016

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Answered: Walter Roberson on 4 Apr 2016

 if T==1
    Disp  = '1'
elseif T==2
    Disp  = '2'
elseif T==3
    Disp  = '3'
elseif T==4
    Disp  = '4'
elseif T==5
    Disp  = '5'
elseif T==6
    Disp  = '6'
elseif T==7
    Disp  = '7'
 else 
 end
 set(handles.text6,'string',Disp)

After number of elseif conditions i am writing above program. I am using GUI method. I am getting error as below.

 Reference to a cleared variable handles.
 Error while evaluating uicontrol Callback

How i can overcome it.! My all Disp values are Numeric only.!

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Nimisha on 4 Apr 2016

Open in MATLAB Online

 function pushbutton10_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton10 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
clear all;clc
load Features.mat
t = a;
[P Q] = size(t);
load FeaturesData1.mat
s = testfea;
for i = 1:P
d(:,i) = dtw(s,t(i,:));
end
W = min(d);
[R T] = find(W ==d);
if T==1
    Disp  = '1'
elseif T==2
    Disp  = '2'
elseif T==3
    Disp  = '3'
elseif T==4
    Disp  = '4'
elseif T==5
    Disp  = '5'
elseif T==6
    Disp  = '6'
elseif T==7
    Disp  = '7'
else 
end
set(handles.text6,'string',Disp)

THIS IS MY COMPLETE CALL BACK FUNCTION.

AND ERROR MESSAGE IS AS BELOW.

 Reference to a cleared variable handles.
 Error in HandGesture>pushbutton10_Callback (line 434)
 set(handles.text6,'string',Disp)
 Error in gui_mainfcn (line 96)
         feval(varargin{:});
 Error in HandGesture (line 42)
    gui_mainfcn(gui_State, varargin{:});
 Error in   @(hObject,eventdata)HandGesture('pushbutton10_Callback',hObject,eventd ata,guidata(hObject))
 Error while evaluating uicontrol Callback

Geoff Hayes on 4 Apr 2016

Open in MATLAB Online

Nimisha - if you always observe this error, then please put a breakpoint at the line

set(handles.text6,'string',Disp)

and then launch your GUI. Do whatever you normally would do and then press pushbutton10. Once the debugger pauses at this line, then look at the handles structure. Is it valid? Does it have a field named text6?

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