Axis Labels and title not appearing in app designer

I have created an app where you can change the plot types on the axis (eg line, scatter or scatter with average) and can also choose to add a second y-axis (using yy options) or colour axis. On R2019B I did something like the below example when ever I change the plot variables as if i plotted left and right Y axis and then went back to just a left Y Axis it would keep the right Y axis there and the label, this worked perfectly (please note this isnt the exact code and just an example showing what i mean).

cla(UIAxes,'reset')

ylabel(app.UIAxes, app.LeftYAxisDropDown.Value)

xlabel(app.UIAxes, app.XAxisDropDown.Value)

plot(x,y)

Now I have moved to 2020B it wipes all the axis labels and titles even though I haven't changed the code and are still defining them after I reset the axis.

Answer 1

[Image Analyst]

xlabel() and ylabel() take a string. So after the axes handle, you have to give a string, not the index of the selected drop down list. Presumably the string you want to show is in the drop down list. Here is how to get it:

selectedIndex = app.LeftYAxisDropDown.Value;
dropDownItems = app.LeftYAxisDropDown.String; % Get all drop down items into a cell array.
axisLabel = dropDownItems{dropDownItems};
ylabel(app.UIAxes, axisLabel)

selectedIndex = app.XAxisDropDown.Value;
dropDownItems = app.XAxisDropDown.String; % Get all drop down items into a cell array.
axisLabel = dropDownItems{dropDownItems};
xlabel(app.UIAxes, axisLabel)

[Huw Wadkin]

Hi Image Analyst,

I think the .Value of drop down UI is already a string, i could be wrong. After playing around with it myself for some reason the problem is fixed if I define the plot and then the labels, if I defined the labels first it wiped then the plot the labels won't appear? This didn't seem to be the case on 2019b.