Ismael - you can try nesting your callback within your function that creates the GUI. A benefit of nested functions is that they have access to the local variables within the "main" function. Try the following
function build_GUI
% create the figure
hFig = figure('Position',[0 0 968 542]);
% create the button group
dpb = uibuttongroup('FontSize',12,'Position',[.015 .65 .17 .28]);
% add the radio buttons to the button group
u0 = uicontrol(dpb,'Style','radiobutton','String','P-130',...
'Position',[30 110 100 30],'BackgroundColor',[.8,.8,.8],'Tag','1');
u1 = uicontrol(dpb,'Style','radiobutton','String','FAST',...
'Position',[30 65 100 30],'BackgroundColor',[.8,.8,.8],'Tag','2');
u2 = uicontrol(dpb,'Style','radiobutton','String','SLOW',...
'Position',[30 20 100 30],'BackgroundColor',[.8,.8,.8],'Tag','3');
% set the callbacks
set(dpb,'SelectedObject',[]); % No selection
set(dpb,'SelectionChangeFcn',@dpbcbk); %Deceleration profile's callback
% do other stuff
% create the edit box (note hFig being used instead of your pdp)
edt4 = uicontrol(hFig,'Style','edit','Position',[330 200 80 20]);
% define the (nested) button group callback
function dpbcbk(source,eventdata)
switch get(eventdata.NewValue,'tag')
case '1'
set(edt4,'String','130');
case '2'
set(edt4,'String','150');
case '3'
set(edt4,'String','110');
end
end % end for dpbcbk
end % end for build_GUI
Now, the SelectionChangeFcn callback, which hasn't changed, has access to the edt4 handle, a local variable of build_GUI, and can update this control.
Try the above and see what happens!
