how to change default radiobutton ?

Question

ElizabethR 2016-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/282946-how-to-change-default-radiobutton

评论： Douglas Anderson 2022-2-11

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

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CS Researcher 2016-5-6

Can you share your .m code?

ElizabethR 2016-5-6

在 MATLAB Online 中打开

 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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Answer 1

Walter Roberson 2016-6-16

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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.

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ElizabethR 2016-6-16

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 ^^

Douglas Anderson 2022-2-11

Brilliant Walter! Thank you!

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Answer 2

Image Analyst 2016-5-6

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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.

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Image Analyst 2016-5-10

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 2016-6-16

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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Answer 3

Stalin Samuel 2016-5-6

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在 MATLAB Online 中打开

*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);

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ElizabethR 2016-5-8

在 MATLAB Online 中打开

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