Legend in Boxplot, colours don't match

Question

Emma Southall 2017-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/353185-legend-in-boxplot-colours-don-t-match

评论： Patrick Malgaroli 2022-3-23

Hi, My problem is when I make a legend for my boxplots, they all have the same colours. I've read other solutions online however since I have 54 boxplots I don't want to manually enter their colours. This is my code,

PR1 = boxplot(dataset, titles);
set(gca, 'xtick', []);
set(findobj(gca,'type','line'),'linew',2);
h = findobj(gca,'Tag','Box');
CM = hsv(54);                                     
for j=1:length(h)
  patch(get(h(j),'XData'),get(h(j),'YData'), CM(j,:),'FaceAlpha',.5);
end
legend(h, titles, 'location', 'Westoutside')

I've also attached an image of the graphic so you can see the problem.

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Answer 1

Vikaasa Kumar 2017-8-21

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Hi Emma,

Here, "h" is being constructed as a Line array, with all the lines set to color [0 0 1], which is blue. Since you are making the legend passing "h" and "titles" as arguments, the legend results with a set of blue lines.

This can be resolved by setting the line color in "h" to the patch color within the for-loop, as shown in the following modified code snippet:

PR1 = boxplot(dataset, titles);
set(gca, 'xtick', []);
set(findobj(gca,'type','line'),'linew',2);
h = findobj(gca,'Tag','Box');
CM = hsv(54);          
for j=1:length(h)
  x = patch(get(h(j),'XData'),get(h(j),'YData'), CM(j,:),'FaceAlpha',.5);
    % MODIFICATION TO SET THE LINE COLOR TO PATCH COLOR:
    h(length(h)-j+1).Color = x.FaceColor; % reordered to match
  end
legend(h, titles, 'location', 'Westoutside')