MATLAB: Updating GUI Popup Menu in Seperate Callback Function

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Hi There,
I am writing a basic programme that can output a number of different signals (sin, sawtooth, etc) and vary them using mutliple sliders. I cannot get the dropdown menu to update.
I am using 'updateAll', so that all sliders dropdowns, etc update the graph simultaneously when used.
Thanks
function popChoice_Callback(hObject, eventdata, handles)
contents = cellstr(get(hObject,'String'));
popChoice = contents(get(hObject,'Value'));
if (strcmp(popChoice,'Sine'))
    popVal = 1;
elseif (strcmp(popChoice,'Square'))
    popVal = 2;
elseif (strcmp(popChoice,'Sawtooth'))
    popVal = 3;
elseif (strcmp(popChoice,'Triangular'))
    popVal = 4;
end
assignin('base','popVal',popVal)
updateAll()
%%Some other unrelated coder (sliders, etc) is between these functions
function updateAll 
f=round(getappdata(0,'f'));
S_rate=round(getappdata(0,'S_rate'));
t=round(getappdata(0,'t'));
phi=round(getappdata(0,'phi'));
popVal = getappdata(0,'popVal');
if popVal == 1
    Sin_Wave(f,phi,S_rate,t)
elseif popVal == 2
    Square_Wave(f,phi,S_rate,t)
elseif popVal == 3
    Sawtooth_Wave(f,phi,S_rate,t)
elseif popVal == 4
    Triangle_Wave(f,phi,S_rate,t)
end

Best Answer

getappdata is used to retrieve data stored using the setappdata function.
setappdata stored data in a UI. Both these functions provide a convenient way to share data between callbacks or between separate UIs.
setappdata(0,...) sets the variable value in root not workspace.
getappdata(0,...) gets the variable value from root not workspace.
Use evalin to access data from different workspace.
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