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how to change default radiobutton ?

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i have two radio button like in this image.
but, if i load the gui, and i choose the option 1 ( bwareopen ) it doesn't work. I must choose option 2 ( opening ) first, and then i choose option two ( opening ) if I want to proceed with option 1. How to fix it ? How to change default radio button ?? thanks

  2 Comments

CS Researcher
CS Researcher on 6 May 2016
Can you share your .m code?
ElizabethR
ElizabethR on 6 May 2016
function prepo_SelectionChangeFcn(hObject, eventdata, handles)
% hObject handle to the selected object in prepo
% eventdata structure with the following fields (see UIBUTTONGROUP)
% EventName: string 'SelectionChanged' (read only)
% OldValue: handle of the previously selected object or empty if none was selected
% NewValue: handle of the currently selected object
% handles structure with handles and user data (see GUIDATA)
switch get(eventdata.NewValue,'Tag') % Get Tag of selected object.
case 'prepo1'
global image;
r=imresize(image,[128 128]);
bw=im2bw(r);
c=imcomplement(bw);
ba=bwareaopen(c,100);
d=imcomplement(ba);
se=strel('disk',2);
open=imopen(d,se);
axes(handles.axes2);
imshow(open);
case 'prepo2'
global image;
r=imresize(image,[128 128]);
bw=im2bw(r);
se=strel('disk',2);
open=imopen(bw,se);
axes(handles.axes2);
imshow(open);
end

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Accepted Answer

Walter Roberson
Walter Roberson on 16 Jun 2016
uibuttongroup always have one of the buttons selected. It is not possible to put a uibuttongroup into a state of not having any of the buttons selected.
What you can do is add a third button to the group whose Visible property is set 'off', and set up the uibuttongroup so that the third (invisible) button is the one initially selected. Neither of the two visible buttons will be selected if you do this, so you would be able to select the first button and have it generate the callback immediately.

  1 Comment

ElizabethR
ElizabethR on 16 Jun 2016
hi Walter Roberson.. oohh yes, you are right. well, i never thought about it that way. i've tried, and it working perfectly. thank you so much Walter Roberson, God Bless ^^

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More Answers (2)

Image Analyst
Image Analyst on 6 May 2016
I don't know exactly what "it doesn't work" means. Were you expecting the state of the radio button to toggle? Were you expecting to have a callback function run automatically?
To set the default button to be selected, set the "Value" property of the button, in GUIDE, to be 1. The others in that button group will be set to zero and that one will be the one that's selected when your GUI launches.

  9 Comments

Show 6 older comments
ElizabethR
ElizabethR on 10 May 2016
thanks for answare it, what i mean is, i have 2 radiobutton in button group. If i load GUI, i input the image and then i choose one of two radiobutton. When i load GUI and i choose the radio1, the function in radion 1 is not working. So, if i want to choose radio 1, i must choose radio2 first and then choose radio1. So the function in radio1 will work. sorry for my bad english. Hope you will understand
Image Analyst
Image Analyst on 10 May 2016
The same prepo_SelectionChangeFcn() gets executed no matter which one you click on. Set a breakpoint in it and then run your GUI. Then click on radio button 1 and see if it goes into the prepo_SelectionChangeFcn() function. Then again when you click on radioobutton2, and then again when you click on radiobutton1 again. When does it stop at the breakpoint? It should stop there all three times. If not, attach your m-file and fig-file so i can try it.
ElizabethR
ElizabethR on 16 Jun 2016
hi image analyst, i've tried it. i've set a breakpoint. Then i click on radiobutton1, then click to radiobutton2, but, it always goes in 'switch get(eventdata.NewValue,'Tag') ' like image that i attach
and it the radiobutton didn't work if i first click in radiobutton1 after i lunch the gui. How to fix it ? hope you will help me. Thank you

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Stalin Samuel
Stalin Samuel on 6 May 2016
*Example code*
function my
handles.FigureH = figure;
handles.radio(1) = uicontrol('Style', 'radiobutton', ...
'Callback', @myRadio, ...
'Units', 'pixels', ...
'Position', [10, 10, 110, 22], ...
'String', 'Bwareaopen', ...
'Value', 1);
handles.radio(2) = uicontrol('Style', 'radiobutton', ...
'Callback', @myRadio, ...
'Units', 'pixels', ...
'Position', [10, 40, 80, 22], ...
'String', 'opening', ...
'Value', 0);
...
guidata(handles.FigureH, handles);
function myRadio(RadioH, EventData)
handles = guidata(RadioH);
otherRadio = handles.radio(handles.radio ~= RadioH);
set(otherRadio, 'Value', 0);

  1 Comment

ElizabethR
ElizabethR on 8 May 2016
function prepo_SelectionChangeFcn(hObject, eventdata, handles)
% hObject handle to the selected object in prepo
% eventdata structure with the following fields (see UIBUTTONGROUP)
% EventName: string 'SelectionChanged' (read only)
% OldValue: handle of the previously selected object or empty if none was selected
% NewValue: handle of the currently selected object
% handles structure with handles and user data (see GUIDATA)
switch get(eventdata.NewValue,'Tag') % Get Tag of selected object.
case 'prepo1'
global image;
r=imresize(image,[128 128]);
bw=im2bw(r);
c=imcomplement(bw);
ba=bwareaopen(c,100);
d=imcomplement(ba);
se=strel('disk',2);
open=imopen(d,se);
axes(handles.axes2);
imshow(open);
case 'prepo2'
global image;
r=imresize(image,[128 128]);
bw=im2bw(r);
se=strel('disk',2);
open=imopen(bw,se);
axes(handles.axes2);
imshow(open);
end
this is my code, so where i write your example code ?

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