Dorp Down Menu in App Designer doesn't accept values

Hi everyone,

I'm trying to use a drop down menu in App Design to plot different channles from a .csv file. Essentially, it has a (time, fx,fy,fz) column structure. I have created the drop down menu button, and assigned Items and the corresponding values I want those items to have. However, I'm having trouble in the execution, as it seems that only one value is passed through properly, resulting in 2/3 graphs being completely broken. When I try to debug it by setting a different initial value, this is the error I get. I've researched it and there's not much info out there on how to fix it, especially since I'm seemengly doing a very simple thing. When I try to change the 'Value' from 2 to any other in the 'Items Data' list, I get the error.

The follwing is the UI component code generated by App Designer as well.

% Create AxisDropDownProcessing

app.AxisDropDownProcessing = uidropdown(app.PreprocessingTab);

app.AxisDropDownProcessing.Items = {'X', 'Y', 'Z'};

app.AxisDropDownProcessing.ItemsData = [2 3 4];

app.AxisDropDownProcessing.Editable = 'on';

app.AxisDropDownProcessing.ValueChangedFcn = createCallbackFcn(app, @AxisDropDownProcessingValueChanged, true);

app.AxisDropDownProcessing.BackgroundColor = [1 1 1];

app.AxisDropDownProcessing.Position = [67 648 50 22];

app.AxisDropDownProcessing.Value = 2;

Answer 1

[Cris LaPierre]

I see the same behavior. However, I could use the button with the vertical 3 dots to the right of the Value and Items fields to modify the default selection.

[Dennis Premoli]

Indeed. Might this be a bug in Matlab itself?

[Cris LaPierre]

After playing around some more, the issue may be with how the data is entered.

If I do not put my items in quotes, then I can change 'Value' property without using the popup and without getting an error message.

[Dennis Premoli]

It doesn't appear to work as seamlessly as perhaps it is eant to be but inputting them via the vertical 3 dot menu seems to bypass the issue.

[Cris LaPierre]

Remove the quotes around the Value and Items names, and it will work the way you expect.