How to assign a value using a RADIO Button in the GUI

I want to use 2 radio buttons in a GUI in this way:

radiobutton1 -> acceleration = 1; radiobutton2 -> acceleration = -1;

Then I want to use this "acceleration" within other functions that are used by the GUI.

I've no problems with "Edit text", "Push buttons" and others, but I'm struggling with the Radio Button. For example I can use a value with the "Edit text" simply buy writing

value = handles.EDIT_TEXT;

But I'm not able to do the same with a radio button.

Thanks in advance!

Answer 1

[debasish]

1.Create the two radio buttons in a button panel

2.Set the properties of each radio button.(tag,font,string,etc).lets assume tags be 'accel1_radiobutton' and 'accel2_radiobutton'.

Set the tag of button panel to 'acceleration_buttongroup'.

3.Add this line of code to the opening function

 set(handles.acceleration_buttongroup, 'SelectionChangeFcn',  @acceleration_buttongroup_SelectionChangeFcn);

4.Next,add the following function at the very end of .m file

 function acceleration_buttongroup_SelectionChangeFcn(hObject, eventdata)

 handles=guidata(hObject);

 switch get(eventdata.Newvalue,  'Tag' )

 case 'accel1_radiobutton'

 handles.value= 1;  %%any handle where value is to be stored

 case accel2_radiobutton

 %%similarly set the value '-1'

[Future Science]

I get this error, if I set handles.value = 1 (or handles.ACCELERATION = 1)

Reference to non-existent field 'value'. (or 'ACCELERATION')

Error in my_gui_function>Start_Callback (line 865)

acceleration = handles.value;

[Walter Roberson]

At the end of the code that debasish shows, add

guidata(hObject, handles);

[Future Science]

It works!

My fault for writing h0bject instead of hObject!

Thanks to the both of you!

PS for anybodyelse who's reading this:

it is:

switch get(eventdata.NewValue, 'Tag' ) instead of .Newvalue

and then of course just write "end" after your last "case".

[Christoforos Rekatsinas]

Hi guys. So far so good. But i have a problem thow. The handles structure isnt gettin updateed with the new variable after exiting the buttongroup function. ANy recomendations?

[Preshma Linet Pereira]

thanks @debasish!

Answer 2

[Future Science]

Another question: even tough the radio button appears to be selected by default, if I don't manually select "acceleration2" and then "acceleration1" it won't load a value.

Is there a workaround for this?

[Walter Roberson]

After you have done the set() that debasish mentioned in step 3, then invoke

acceleration_buttongroup_SelectionChangeFcn( handles.acceleration_buttongroup, struct( 'NewValue', handles.accel1_radiobutton ) )

That is, you will be calling the callback routine with artificial values.

[Future Science]

Thanks, very helpful as usual!

[Preshma Linet Pereira]

thank you @walter roberson! really helped! was stuck with the same problem.