Not able to run any GUI related code

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Dr. Hareesha N G
Dr. Hareesha N G 2018-2-19
回答： msahar 2018-6-2
Dear Experts, I am a new learner of MATLAB GUI. I am practicing it using the tutorials available in YOUTUBE.But, I am not able to run any GUI related code in my system.
I am using MATLAB 2012b and Windows-10. MATLAB is custom installed with basic MATLAB only.
Reference to non-existent field 'editl'.
This is the error I get.
Error in ex_2>pushbutton1_Callback (line 151) x = get( handles.editl,'String');
Error in gui_mainfcn (line 96) feval(varargin{:});
Error in ex_2 (line 42) gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)ex_2('pushbutton1_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

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回答（4 个）

ES
ES 2018-2-19
I think there is a typing there in line 151.
x = get( handles.edit,'String');
what this line does is, it gets the content from an edit box with tag 'edit' and puts it in x. You have mentioned it as editl.
Jan
Jan 2018-2-19
编辑：Jan 2018-2-19
Use the debugger to examine the problem: https://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html. Use e.g.:
dbstop if error
to let Matlab stop, when the error occurs. Then check, why the field is missing:
fieldnames(handles)
According tp the error message there is no field called 'editl'. Most likely there is one with the name 'edit1' - with a one at the end, not a lower-case L.
Dr. Hareesha N G
Dr. Hareesha N G 2018-2-19
Sir,
I changed the code using other inputs. But, still not working. I am using GUI for the first time. So, able to find the actual error. Code is attached. Please help me.
Thanks
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Dr. Hareesha N G
Dr. Hareesha N G 2018-2-19
Getting the following error when this code is executed.
Error using matlab.ui.Figure/set There is no String property on the Figure class.
Error in ex_2>perform_Callback (line 155) set(handles.output,'String', x+y);
Error in gui_mainfcn (line 95) feval(varargin{:});
Error in ex_2 (line 42) gui_mainfcn(gui_State, varargin{:});
Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)ex_2('perform_Callback',hObject,eventdata,guidata(hObject)) Error while evaluating UIControl Callback
>>
Jan
Jan 2018-2-19
Isn't the error message clear already? handles.output is set to the handle of the figure in this line:
function ex_2_OpeningFcn(hObject, eventdata, handles, varargin)
...
handles.output = hObject;
Then you cannot set its 'String' property, because figures do not have such a property. Only uicontrol objects have them. So check, where you want what to appear and modify this line accordingly:
set(handles.output, 'String', x+y);
By the way: I prefer to set the 'String' property to a string (char vector), not to a number (although this works, at least in modern Matlab versions):
set(handles.otherHandle, 'String', sprintf('%g', x+y));

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msahar
msahar 2018-6-2
I guess you do not have ex_2.fig file in your folder. Put ex_2.m and ex_2.fig files in same folder and run it.

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