I would suggest that you create a generic callback function, and give each of your objects a Tag with an appropriate name.
In this case, the edit box would have
set(handles.edit1,'Tag','handles.edit')
and slider would be
set(handles.slider1,'Tag','handles.slider1')
Assign a generic callback to each
set(handles.edit1,'Callback',@genericCB)
set(handles.slider1,'Callback',@genericCB)
Now you create the generic callback that reads the Tag
function genericCB(src,eventdata)
handleLink = get(src,'Tag')
if any(regexp(handleLink,'edit1'))
% The edit1 object was called, update slider1
elseif any(regexp(handleLink,'slider1'))
% The slider1 object was called, update edit1
end
Edit: When you enter a value into the edit box, the callback will not be called until you click outside of the edit box or press on the keyboard. If you want the slider to update as you are typing, I believe you'll need to create a java object instead of a uicontrol object
