in Regard of Feval error

hi

i have come across the following error -

Error using feval
Undefined function 'viewpm_Callback' for input arguments of type 'struct'.

Error in gui_mainfcn (line 96)
        feval(varargin{:});

Error in radar_waveform_analyzer_18july (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)radar_waveform_analyzer_18july('viewpm_Callback',hObject,eventdata,guidata(hObject))

   Error while evaluating uicontrol Callback

when i go to callback function of viewpm( pop-up menu in gui) i get no code for dat, however the concerned code is elsewhere in .m file. although i m able to run the gui , but its functionality has been changed. i am also attaching .m code file.

pls contribute and resolve.

Thanks and Regards,

Rahul sharma

[Geoff Hayes]

Rahul - rather than attaching two zip files, try to use the question body to describe in some detail what is the problem that you are experiencing with feval. What are you attempting to do with your code? What is the error message that is being generated?

[Image Analyst]

I didn't even attempt to look at or debug that rtf file. If you want help, just attach the m-file and fig file as two separate attachments so we can run the app.

[FaithM]

I am having a similar error with my code. See the section of the code below (lines 91-98). The Error I keep getting says

Error in gui_mainfcn (line 96) feval(varargin{:});

 % evaluate the callback now
    varargin{1} = gui_State.gui_Callback;
    if nargout
        [varargout{1:nargout}] = feval(varargin{:});
    else       
        feval(varargin{:});
    end

[Geoff Hayes]

Faith - you may want to provide more context. When does this error occur? Have you created your GUI with GUIDE, programmatically, or with App Designer?

[Walter Roberson]

Faith Mwiza:

You would get that error if you renamed your .m file instead of going through GUIDE and telling it to save as a new name.

Answer 1

[Geoff Hayes]

Rahul - I looked at the code in your attachment (next time, just attach the m-file - there is no need to paste its contents into an rtf file and zip it up).

The error

 Error using feval Undefined function 'viewpm_Callback' for input arguments of type 'struct'.
 Error in gui_mainfcn (line 96) feval(varargin{:});
 Error in radar_waveform_analyzer_18july (line 42) gui_mainfcn(gui_State, varargin{:});

 Error in  @(hObject,eventdata)radar_waveform_analyzer_18july('viewpm_Callback',hObject,
            eventdata,guidata(hObject))

 Error while evaluating uicontrol Callback

indicates that the gui_mainfcn, which calls feval, cannot find the function viewpm_Callback. That is because this function (signature and body) is commented out in your attached file.

I created a simple GUI with a single pushbutton, and if I commented out its callback, then pressing the button resulted in the same error message that you observed.

I recommend that you uncomment this function, and try running the GUI again.