How to get the value of Radio buttons from App Designer

Question

Leon 2019-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/468609-how-to-get-the-value-of-radio-buttons-from-app-designer

评论： Csanád Temesvári 2021-3-23

采纳的回答： Adam Danz

Here is my radio button:

app.ButtonGroup

app.A_button
app.B_button

What I want to do is this:

Button A should be the default button. If the button A is stay pushed or the user does not do anything to this group of buttons, my button value should be 10. If Button B is pushed, my overall button value should be 14.

How can I achieve that? Sorry for the basic question. I'm new to app designer.

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Geoff Hayes 2019-6-24

Leon - what do you mean by button value? Is this a value that you use in some sort of calculation?

Leon 2019-6-24

在 MATLAB Online 中打开

Yes, it is a value I use for some later calculation.

We can derive these values fomr an if loop, I guess.

If Button A is slected 
Val = 10
else 
Val = 14
end

My problem is that I do not know how to specify the if sentence.

Thanks

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Answer 1

Adam Danz 2019-6-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/468609-how-to-get-the-value-of-radio-buttons-from-app-designer#answer_380568

编辑：Adam Danz 2019-6-24

在 MATLAB Online 中打开

The 'Value' property of the radio buttons returns a logical that is true when selected and false otherwise. Here's an example to follow below.

if app.Button1.Value   %where "Button1" is the name of the first radio button
    Val = 10
elseif app.Button2.Value
    Val = 14
else
    Val = 0; 
end

Another way to do that is to use the 'SelectedObject' property of the ButtonGroup along with a switch-case.

switch app.ButtonGroup.SelectedObject.Text
    case 'Button1' %where "Button1" is the name of the first radio button
        val = 10; 
    case 'Button2'
        val = 14; 
    otherwise
        val = 0; 
end

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Csanád Temesvári 2021-3-22

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Absolutely!

First some preliminaries: I'm making a school assignment showcasing various affine transformations using homogenous coordinates.

The premise is the following: The user enters numerical values for the transformations (translation vector, angle of rotation, etc., ) into text edit fields, I convert the characters into vectors, create the appropriate matrix, multiply the converted point coordinates with the transformation matrix, convert it back to normal coordinates and then plot the results according to what "shape" the user wants to transform (top left).

That's where the error comes in.

Here's the mesage and the code it produces:

Unable to resolve the name app.Alakzat_2D_ButtonGroup.SelectedObject.Text.
Error in transzform/points_2D_boxValueChanged (line 374)
            plot_2D(app)
            
            
function [] = plot_2D(~)
            switch app.Alakzat_2D_ButtonGroup.SelectedObject.Text
                case "Pont"
                    scatter(app.UIAxes_2D, app.PlottedData_2D(:, 1), app.PlottedData_2D(:, 2), 'filled')
                case "Bézier-görbe"
                    sym t
                    D = bernsteinMatrix(size(app.PlottedData_2D, 1) - 1, t);
                    beziergorbe = simplify(D*app.PlottedData_2D);
                    fplot(app.UIAxes_2D, beziergorbe(:, 1), beziergorbe(:, 2), [0 1])
                    hold on
                    scatter(app.UIAxes_2D, app.PlottedData_2D(:, 1), app.PlottedData_2D(:, 2), 'filled')
                    hold off
                case "Sokszög"
                    fill(app.UIAxes_2D, app.PlottedData_2D(:, 1), app.PlottedData_2D(:, 2), 'b')
            end
end

I tried both the SelectedObject.Text and the if Button.Value methods and none of them worked.

I hope this isn't egregious and makes sense :)

Adam Danz 2021-3-22

在 MATLAB Online 中打开

> Unable to resolve the name app.Alakzat_2D_ButtonGroup.SelectedObject.Text.

Take a look at your function,

function [] = plot_2D(~)
    switch app.Alakzat_2D_ButtonGroup.SelectedObject.Text

It has no inputs.

You have to pass the app variable to it and there should be a warning in AppDesigner on that line of code indicating that you're not passing the app variable, unless this function is outside of AppDesigner.

Csanád Temesvári 2021-3-23

Thank you so much!

Obviously, I ran into further problems after I fixed that one, but that's just programming :)

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How to get the value of Radio buttons from App Designer

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