How to get an output data from a GUI popup menu to use as data in .m file.

From the popupmenu created in GUIDE, I want to get the data choosen by the user for Month and feeder and use it as an input data to my separate .m file.

[Walter Roberson]

choice_idx = get(handles.popupmenu3, 'value');

if you want the numeric form. If you want the month name, then

month_names = get(handles.popupmenu3, 'string');
choice_string = month_names{get(handles.popupmenu3, 'value')};

[Maria Pati]

I got this error after running my .m script file.

Undefined variable "handles" or class "handles.popupmenu3".

Error in intsection2018 (line 263)

month_names = get(handles.popupmenu3, 'String');

[Walter Roberson]

Provided that you only have one figure, which is the GUI, then:

handles = guidata(gcf);

[Maria Pati]

function varargout = popupmenu3(varargin)

gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @popupmenu3_OpeningFcn, ...
                   'gui_OutputFcn',  @popupmenu3_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 popupmenu3 is made visible.
function popupmenu3_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 popupmenu3 (see VARARGIN)

% Choose default command line output for popupmenu3
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes popupmenu3 wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = popupmenu3_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 popupmenu3.
function popmonth_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (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 popupmenu3 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu3
items = get(hObject, 'String');
index_selected1 = get(hObject,'Value')
item_selected = items{index_selected1};
display(item_selected);

% --- Executes during object creation, after setting all properties.
function popmonth_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (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 selection change in popupmenu3.
function popfeeder_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (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 popupmenu3 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu3
items = get(hObject, 'String');
index_selected2 = get(hObject,'Value');
item_selected = items{index_selected2};
display(item_selected);

% --- Executes during object creation, after setting all properties.
function popfeeder_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (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

Above is the code for the popupmenu3. Executing this code, a popup menu would appear to let the user choose his preferred month and feeder. Form this code, it returns item selected in the command window. My problem is how to use that output in my .m script file.

[Walter Roberson]

month_names = get(handles.popmonth, 'string');
choice_string = month_names{get(handles.popmonth, 'value')};

[Adam]

Simplest option is to call your script (which ideally should be a function) from inside the popup menu's callback.

If you want the popup menu GUI to close after selection and then use the result you will need to use

doc uiwait

with a matched uiresume and assign your popup menu results to the handles.output that you return (or you can return anything from handles if you change the line in the OutputFcn to have different or more varargout arguments).