How can I update the results from a Timer to a text box every 5 second?

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My codes are shown as below:
TimeSpan = str2double(get(handles.edit1,'String'));
Parameter = str2double(get(handles.edit2,'String'));
My function is
funcion Output=MyFuc(Parameter)
How can I show 'Output' in textbox ('edit3') every 5 seconds (let's say TimeSpan=5);
So many thanks. I've been working on this for 2 days. Still cannot find correct answer....
Many thanks to everyone helping me.

Accepted Answer

Sean de Wolski
Sean de Wolski on 4 Feb 2013
h = uicontrol('Units','Normalized','FontSize',15,'Position',[0.1 0.1 0.8 0.8],...
T = timer('Period',5,'StartDelay',0,'TimerFcn',@(src,evt)set(h,'String',evalc('why')),...

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