MATLAB: Random values by default? [GUI]

checkboxdefaultglobalguiguide

Hi,
i created the following script:
        function pushbutton1_Callback(hObject, eventdata, handles)
                                            global cb7;
                                            global cb8;
                                            if (cb7 == 0)
                                             %(action1)
                                            end
                                            if (cb8 == 0)
                                             %(action2)  
                                            end
    function checkbox7_Callback(hObject, eventdata, handles)
                                       a=get(hObject,'Value');
                                       global cb7;
                                       if (a==1)                                         
                                          cb7=0;                                            
                                       else
                                          cb7=1;
                                       end
    function checkbox8_Callback(hObject, eventdata, handles)
                                       a=get(hObject,'Value');
                                       global cb8;
                                       if (a==1)                                         
                                          cb8=0;                                            
                                       else
                                          cb8=1;
                                       end
When i push the button, cb7 is "1" and cb8 is "0". How can that be? Only when i check and uncheck the boxes before pushing the button, both are "1".
Is it possible to set a default value?
Greetings

Best Answer

mec123 - you can set default values in the OpeningFcn of your GUI. Just do
 set(handles.checkbox8,'Value',1);
to set the checkbox as checked and
 set(handles.checkbox8,'Value',0);
to set the checkbox as unchecked.
Also, there is no need to use global variables. If you want one callback to access the values of the other controls, then use the handles structure as
 function pushbutton1_Callback(hObject, eventdata, handles)
 if get(handles.checkbox7,'Value') == 0
     % do action 1

 end
 if get(handles.checkbox8,'Value') == 0
     % do action 1
 end
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