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Caleb
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Can I force a radio button group to initialize with a certain button selected?

Asked by Caleb
on 14 Aug 2012
As the question says, I want a particular button selected every time the radio button group is initialized. Can I "set()" this somehow?

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3 Answers

Answer by Matt Fig
on 14 Aug 2012
Edited by Matt Fig
on 14 Aug 2012
 Accepted Answer

Have a look at the selectedobject property.
h = uibuttongroup('Pos',[0 0 .2 1]);
u0 = uicontrol(h,'Style','Radio','String','Option 1',...
'pos',[10 350 100 30]);
u1 = uicontrol(h,'Style','Radio','String','Option 2',...
'pos',[10 250 100 30]);
u2 = uicontrol(h,'Style','Radio','String','Option 3',...
'pos',[10 150 100 30]);
set(h,'SelectedObject',u2); % Set the object.
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.
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If you are using GUIDE, simply put this code at the end of the GUI OpeningFcn. For example, if you GUI is called mygui, then look for mygui_OpeningFcn.
% Use the correct names, for the objects, of course...
set(handles.uipanel3,'selectedobject',handles.radiobutton3)

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Answer by Justin
on 14 Aug 2012

First alternative is to use GUIDE. This will allow you to set a specific radio button to "selected" everytime the GUI initializes. To do this, open the "Property Inspector" for the radio button and change its "Value" to 1.
Second alternative is to do it programatically. In your code, wherever you initialize the button-group, execute the following line:
>> set(handles.radioTag,'Value','max');
Where, "radioTag" is whatever tag you assigned to your desired radio button when making the gui.

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Whatever Matt Fig suggested did exactly what I was looking for.
Matt is known for his telepathic responses :)
Here's where I ask for a sample of your code...
But, without seeing a sample, I would suggest you simply enter the line of code I wrote above immediately after the code that "calls" your radio-button group.
EDIT: Use the following line. >> set(handles.radioTag,'Value',1);
Matlab button groups are smart enough to change the other buttons to 0 when a single button is set to 1.

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Answer by Sean de Wolski
on 14 Aug 2012

Of course.
ug = uibuttongroup;
h(1) = uicontrol('style','radio','parent',ug,'position',[50 50 50 10],'value',true,'string','I''m on');
h(2) = uicontrol('style','radio','parent',ug,'position',[20 50 10 10],'value',false);

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