Why boxplot grouping variable plotted out of order?

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Daniel Bridges
Daniel Bridges 2018-2-28
评论： Walter Roberson 2018-10-19
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, %')

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Walter Roberson
Walter Roberson 2018-2-28
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.
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Daniel Broullón
Daniel Broullón 2018-10-18
Hi Walter. I have a similar problem. In my boxplot the categories are ordered according to the order of appearance in the categorical array. I would like to select a specific order. What can I do?
Walter Roberson
Walter Roberson 2018-10-19
https://www.mathworks.com/help/matlab/ref/categorical.html
Use the syntax
B = categorical(A,valueset,catnames)
The sorting will be by the value you associate in valueset, but the names will be what you give in catnames.

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