Use of the Pop-up menu in a GUI

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Guillermo Soriano
Guillermo Soriano 2013-8-23
Hi: I am developping a gui with the function pop-up menú but it does not work. This is the code:
function Vt_Callback(hObject, eventdata, handles)
% hObject handle to Vt (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 Vt contents as cell array
% contents{get(hObject,'Value')} returns selected item from Vt
switch get(handles.Vt_Callback,'Value')
case ('Alta')
Vt = 34;
case ('Media')
Vt = 23;
case ('Baja')
Vt = 18;
end
handles.data.Vt = Vt;
guidata(hObject, handles)
But when I run it, appears following message:
Vt =
NaN
NaN
NaN
Warning: Rank deficient, rank = 0, tol = NaN. > In TDC>pushbutton3_Callback at 422 In gui_mainfcn at 96 In TDC at 42
I will appreciate very much to someone could explain me where is my error regards Willy

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回答（2 个）

Sabarinathan Vadivelu
get(handles.Vt_Callback,'Value')
This returns the value.
Try using:
get(handles.Vt_Callback,'String')
  1 个评论
Guillermo Soriano
Guillermo Soriano 2013-8-23
Hi: Thank you for your quick response. But I got almost the same error: Vt =
NaN
NaN
NaN
Warning: Rank deficient, rank = 0, tol = NaN. I did exactly what you sent. Regards Willy

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David Sanchez
David Sanchez 2013-8-23
Instead of using the string of the selected item, use its position on the list:
switch get(handles.Vt_Callback,'Value')
case 1 %('Alta')
Vt = 34;
case 2 %('Media')
Vt = 23;
case 3 %('Baja')
Vt = 18;
end
  1 个评论
Guillermo Soriano
Guillermo Soriano 2013-8-23
Hi: thank you for your quick assistance. Unfortunately I got following message: Error: File: TDC.m Line: 224 Column: 19 Expression or statement is incomplete or incorrect.
Error in @(hObject,eventdata)TDC('pushbutton3_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
It refers to the statement : case %('Alta') Regards Willy

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