MATLAB: Dynamic popup menu choices in GUIDE

guiguidehandlespopup menu

I am attempting to make dynamic popup menu fields in a GUI made with GUIDE.
My intention is to change the fields when a specific popup choice is picked in another popup menu. The popup menus are initially populated with information from GUIDEs Property Inspector.
This codes works when launching the GUI using after pressing the "play" button in GUIDE. It does not work when launching the figure on its own.
  • * *The error received is "Attempt to reference field of non-structure array."
Why does this happen? How can I make it work like it works when launched from GUIDE?* * *
The relevant code; solver_settings doesn't do anything interesting. From this it can be seen that the intention is to have a certain range of algorithm options available to the user depending on what solver type he picks, because not all of them are relevant to each other. Hence L-M would not be available to fmincon or Genetic Algorithm.
function solver_type_Callback(hObject, eventdata, handles)
% hObject    handle to solver_type (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 solver_type contents as cell array
%        contents{get(hObject,'Value')} returns selected item from solver_type
set1 = {'interior-point';'active-set';'sqp';'trust-region-reflective'};
set2 = {'trust-region-reflective','levenberg-marquardt'};
set3 = {'In progress'};
val = get(hObject,'Value');
str = get(hObject,'String');
switch str{val}
    case 'fmincon'
        assignin('base','optimalg',1);
        set(handles.solver_settings,'String',set1,'Value',1);
    case 'lsqnonlin'
        assignin('base','optimalg',2);
        set(handles.solver_settings,'String',set2,'Value',1);
    case 'Genetic Algorithm'
        assignin('base','optimalg',3);
        set(handles.solver_settings,'String',set3,'Value',1);
end
guidata(hObject, handles)

Best Answer

Sergei - a GUI, as created through GUIDE, can only be launched in one of three ways: through GUIDE, through the MATLAB editor (so you press the run button while editing the m file if the GUI), or from the Command Window by calling the GUI by name
 >> myGui
where you have a myGui.m and myGui.fig files. You cannot double-click on the figure file to launch the GUI because this method will only open the GUI and display its controls. It will not initialize the necessary or appropriate members (like handles) and so you will observe errors like you have described above.
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