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GUI .... tricks of the trade

GUI .... tricks of the trade

GUI .... tricks of the trade

(OP)
I have writen a GUI. I have lots of input fields and one run button. However to run it I always have to always enter something into every field. Some inputs have defaults values I can assign in the .m file. In the run button callback sub function how do I check if there is an input or in must resort to a default value??

My code at the mo (not working):

%input field callback:
handles.output= str2double(get(hObject,'String'));

%run button callback:
if exist('handles.output') == 0
    X = 10;
else
    X = handles.output;
end

why? why? why?

It always says : it always goes in the first one (X = 10) ie it never finds handles.output ... even if it does exist sometimes!!

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