Undefined function or method 'plus' for input arguments of type 'cell'.

hi... someone please help me... i'm stuck with this code:

 % --- Executes on selection change in FirstPopup  function 
FirstPopup_Callback(hObject, eventdata, handles)

    idMode = get (hObject, 'Value');
    if idMode == 1      
       A = set(handles.FirstPopup,'value');
       FirstValue=A +(-11);
    else if idMode == 2
            A= set (handles.FirstPopup, 'Value');
            FirstValue= A+(7);
        end
    end

i try to use "+" to add value i've got from FirstPopup. but there's an error:

" Undefined function or method 'plus' for input arguments of type 'cell'."

now, what should i do..?

[Alex]

Could you also tell us the line where the error is?

Answer 1

[David]

Should the lines

A = set(handles.FirstPopup,'value');

not read

A = get(handles.FirstPopup,'value');

Answer 2

[randy]

thank you for the answer and response.. but i've manipulate it and solve it.. i'm adding one push button and using

set(handles.FirstPopup,'value').. it's look like this:

function button_Ok_Callback(hObject, eventdata, handles)

Value=get(handles.FirstPopup,'value');
if (Value == 1)
    FirstValue=Value-11;
else
    FirstValue=Value+7;
end
.
........
.......
  % --- Executes on selection change in FirstPopup.
function FirstPopup_Callback(hObject, eventdata, handles)
% every command here has been deleted.

thank you... randy