How to obtain the text of the selected radio button group in app designer?

Dear Community

I'm using the app designer to create a radio button group, and I intended to obtain the 'text' of the selection and save it to work space. Right now my code does save the current selection to workspace, but i notice that it only works if I changed the selection. (ie, if I swich from "choice A" to "choice B" or "choice c" then it will save, but if I left it in default "choice A" it stores nothing)

I was wondering how can I resolve this, or perhaps there is another way to save the selection.

here's my callback function for the radio button group

        % Selection changed function: GratingPeriodButtonGroup

        function GratingPeriodButtonGroupSelectionChanged(app, event)

        selectedButton = app.GratingPeriodButtonGroup.SelectedObject.Text;
            
        app.GratingPeriod = selectedButton ;
            
        end

here's the callback funciton of the pushbutton that save the value to workspace

       % Button pushed function: StartButton

        function StartButtonPushed(app, event)

        assignin('base','GratingPeriod',app.GratingPeriod)

        closereq;
            
        end

Answer 1

[Kojiro Saito]

I think you need to add assign an initial value to app.GratingPeriod.

From Code Browser in Code View, click "+" button and add a "StartupFcn" callback function.

Then, write an assignment to app.GratingPeriod.

function startupFcn(app)
    app.GratingPeriod = app.Button.Text;
end

Please change app.Button to the actual button name whose value is "choice A".