how to change variable inside a function from a gui

i need to change a value inside a function from gui. how can i do that?

[Azzi Abdelmalek]

What does that mean?

Answer 1

[Walter Roberson]

There are limited circumstances under which a GUI can force a variable in a function to change. It is easier if the GUI makes the new value available and the function asks for the current value.

   while true
     drawnow();
     should_quit = get(handles.QuitButton, 'Value');
     if should_quit; break; end
     ....
   end

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F