Random values by default? [GUI]

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

Answer 1

[Geoff Hayes]

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

[mec123]

Thank you, that helped a lot. Im pretty new to matlab (as you probably can tell^^) and still learning, so i appreciate it ;).