Displaying text in gui edit text.

function Feeder_Callback(hObject, eventdata, handles)
% hObject    handle to Feeder (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of Feeder as text
%        str2double(get(hObject,'String')) returns contents of Feeder as a double
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
    feeder = 'TEST OUTPUT';
    set(handles.Feeder,'String',(feeder));
end

I've got a problem in displaying my text with the variable name feeder (feeder = 'TEST OUTPUT') in the outputgui.fig. Can anyone knows what's the problem with my code. Thanks a lot.

[Walter Roberson]

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
feeder = 'TEST OUTPUT';
set(handles.Feeder, 'String', feeder);

[Maria Pati]

Thanks @Walter Roberson.