Simple GUI not working, error Varagout feval(...

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Dan
Dan on 19 Jan 2012
hello, I am relatively new to matlab and am trying to teach myself how to create and use GUIs. I am working on a simple test GUI that simply plots a 3D graph. However I cannot seem to get the popup menu to work. I get the following errors and am not sure what they mean.
??? Reference to non-existent field 'output'.
Error in ==> TESTGUI1>TESTGUI1_OutputFcn at 79
varargout{1} = handles.output;
Error in ==> gui_mainfcn at 265
feval(gui_State.gui_OutputFcn, gui_hFigure, [],
gui_Handles);
Error in ==> TESTGUI1 at 42
gui_mainfcn(gui_State, varargin{:});
Not sure what this all means as it was code that came pre-coded into the GUI guide. Any suggestions? I have pasted a copy of my code below if that helps. THANKS!
Dan
function varargout = TESTGUI1(varargin)
% TESTGUI1 MATLAB code for TESTGUI1.fig
% TESTGUI1, by itself, creates a new TESTGUI1 or raises the existing
% singleton*.
%
% H = TESTGUI1 returns the handle to a new TESTGUI1 or the handle to
% the existing singleton*.
%
% TESTGUI1('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in TESTGUI1.M with the given input arguments.
%
% TESTGUI1('Property','Value',...) creates a new TESTGUI1 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before TESTGUI1_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to TESTGUI1_OpeningFcn via varargin.
%
% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
% instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help TESTGUI1
% Last Modified by GUIDE v2.5 19-Jan-2012 13:32:40
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @TESTGUI1_OpeningFcn, ...
'gui_OutputFcn', @TESTGUI1_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before TESTGUI1 is made visible.
function TESTGUI1_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments to TESTGUI1 (see VARARGIN)
% Choose default command line output for TESTGUI1
handles.peaks=peaks(35);
handles.membrane=membrane;
[x,y]=meshgrid(-8:0.5:8);
r=sqrt(x.^2+y.^2)+eps;
sinc=sin(r)./r;
handles.sinc=sinc;
handles.current_data=handles.peaks;
surf(handles.current_data);
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes TESTGUI1 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = TESTGUI1_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Get default command line output from handles structure
varargout{1} = handles.output;
% --- Executes on selection change in popupmenu1.
function popupmenu1_Callback(hObject, eventdata, handles)
% hObject handle to popupmenu1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu1 contents as cell array
% contents{get(hObject,'Value')} returns selected item from popupmenu1
val=get(hObject,'Value');
str=get(hObject,'String');
switch str(val)
case 'Peaks' %user selects peaks
handles.current_data=handles.peaks;
case 'Membrane' %User selects membrane
handles.current_data=handles.membrane;
case 'Sinc' %User selects sinc
handles.current_data=handles.sinc;
end
guidata(hObjects,handles);
% --- Executes during object creation, after setting all properties.
function popupmenu1_CreateFcn(hObject, eventdata, handles)
% hObject handle to popupmenu1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: popupmenu controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
% --- Executes on button press in Pushbutton1.
function Pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to Pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
%Display Surface Plot of the Currently Selected data
surf(handles.current_data);
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
%Display Mesh Plot of the Currently Selected data
mesh(handles.current_data);
% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton3 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
%Display Contour Plot of the Currently Selected data
contour(handles.current_data);
THANKS Again for your help!

Answers (1)

Walter Roberson
Walter Roberson on 19 Jan 2012
In TESTGUI1_OpeningFcn, change the line
surf(handles.current_data);
to
handles.output = surf(handles.current_data);

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