The labelPlot function takes a 1-by-3 string array and uses the elements to label the x- and y-axes and add a title. The function does not allow missing array elements.

function labelPlot(labels)
    arguments
        labels (1,3) string  {mustBeNonmissing}
    end
    xlabel(labels(1))
    ylabel(labels(2))
    title(labels(3))
end

Create a plot and use the labelPlot function to add labels and a title. The function input array contains a missing element so the mustBeNonmissing function throws an error.

plot(1:10)
strLabels = ["X Label",string(missing),"My Plot"];
labelPlot(strLabels)

Error using labelPlot
Invalid argument at position 1. Value must not have missing data.