MATLAB: Boxplot grouping variable plotted out of order

boxplotdisplaygrouping variablelegendMATLAB and Simulink Student Suiteplottext;

Why is the grouping variable not plotted in the order I've listed it in my code? How do I make it plot sequentially? Please compare the figure with its code.
group = cell(1,2);
doseloop = 192;
for loop = 1:height(newvoldata{doseloop})
    if strcmpi('blurred',newvoldata{doseloop}.DistributionType(loop))
    switch newvoldata{doseloop}.StudyID(loop)
        case {1,2,3,4,5,6,7,8,9,10,13,36} %12
            group{2} = [group{2}; 'Grade 0'];
        case {14,15,19,20,21,22,23,29,30,31,34,37,38,39} % 14
            group{2} = [group{2}; 'Grade 1'];
        case {11,12,16,17,18,25,26,27,28,32,33,35,40} % 13
            group{2} = [group{2}; 'Grade 2'];
        case 24 % 1
            group{2} = [group{2}; 'Grade 3'];
        otherwise
            error('Our code didn''t work as planned.')
    end
    group{1} = [group{1}; newvoldata{doseloop}.Dose(loop)];
    end
end
figure
 boxplot(newvoldata{doseloop}.Volume(strcmpi('blurred',newvoldata{doseloop}.DistributionType)),group)
 title([organofinterest,' Blurred DVH Comparison for 40 Pt Given GU Toxicity'])
 ylabel('Percent Volumes receiving given dose, %')

Best Answer

1 to 10 are Grade 0. 11 is Grade 2. If the labels are to be displayed according to numeric order of the source then that is going to result in Grade 0 then Grade 2 appearing, exactly as happens.
boxplot has no knowledge of how the data was computed. If you had rearranged the case order or scrambled the numeric order of the numbers within the case then the computed data would be the same and the display would be the same.
Related Question