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How to know if a radio button is selected or not?

 I have one GUI with 4 Radio Buttons and one Push Putton. All of them are in one Button Group.

 
I want, if the user didn't select any radio button, then the Push Button will do code-A, and if the user selected any of the radio buttons, then the Push Button will do code-B.
 
Any idea how to do that?
 
The code below is in my Push Button Function
 
if 
   %user did not select any radio button, then do this

else

%do this if a user selected a radio button

      switch get(get(handles.uipanel4,'SelectedObject'),'Tag')

      case 'radiobutton5',  line_type = 'imline';

      case 'radiobutton6',  line_type = 'impoint';

      case 'radiobutton7',  line_type = 'imfreehand';    

      case 'radiobutton8',  line_type = 'impoly';

end

 





ANSWER



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Anyway what you can do is in the callback function of your pushbutton, write this if else statement
 
 
if (get(handles.radiobutton1,'Value') == 0 && get(handles.radiobutton2,'Value') == 0 &&  get(handles.radiobutton3,'Value') == 0 && get(handles.radiobutton4,'Value' == 0)

    %user did not select any radio button, then do this
  else
    %do this if a user selected a radio button

      switch get(get(handles.uipanel4,'SelectedObject'),'Tag')

      case 'radiobutton5',  line_type = 'imline';

      case 'radiobutton6',  line_type = 'impoint';

      case 'radiobutton7',  line_type = 'imfreehand';    

      case 'radiobutton8',  line_type = 'impoly';
  end

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