Kindly guide on how to connect the median points of boxplot with line and how to obtain respective colors of boxplot in the legend. Please help. Added the pot for reference.

Question

Swathi S 2021-5-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/836628-kindly-guide-on-how-to-connect-the-median-points-of-boxplot-with-line-and-how-to-obtain-respective-c

评论： Swathi S 2021-5-23

采纳的回答： Adam Danz

Boxplot.png

在 MATLAB Online 中打开

CODE:

A1 = [36 38 39]';
B1 = [1 5 10]';
C1 = [-17 -11 -2]';
group = [    ones(size(A1));
         2 * ones(size(B1));
         3 * ones(size(C1))];
h1=boxplot([A1; B1; C1],group,'colors','b','widths',0.25,'BoxStyle','filled')
lines = findobj(gcf, 'type', 'line', 'Tag', 'Median');
set(lines, 'Color', 'g');
hold on
a3 = [27 30 36]';
b3 = [-26 -16 1]';
c3 = [-64 -47 -18]';
group = [    ones(size(a3));
         2 * ones(size(b3));
         3 * ones(size(c3))];
% figure
h2=boxplot([a3; b3; c3],group,'colors','r','widths',0.25,'BoxStyle','filled')
set(gca,'XTickLabel',{'1','3','5'})
lines = findobj(gcf, 'type', 'line', 'Tag', 'Median');
set(lines, 'Color', 'y');
hold on
a5 = [-14 1 35]';
b5 = [-152 -104 -3]';
c5 = [-274 -195 -26]';
group = [    ones(size(a5));
         2 * ones(size(b5));
         3 * ones(size(c5))];
% figure
h3=boxplot([a5; b5; c5],group,'colors','g','widths',0.25,'BoxStyle','filled')
set(gca,'XTickLabel',{'1','3','5'})
lines = findobj(gcf, 'type', 'line', 'Tag', 'Median');
set(lines, 'Color', 'y');
legend(findobj(gca,'Tag','Box'),'a','b','c')

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Answer 1

Adam Danz 2021-5-22

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/836628-kindly-guide-on-how-to-connect-the-median-points-of-boxplot-with-line-and-how-to-obtain-respective-c#answer_705808

在 MATLAB Online 中打开

There are multiple ways to do this. Since you're already finding the median line objects, you could extract the coordinates from those lines (demonstrated below).

Otherwise, you could compute the medians directly from each group.

A1 = [36 38 39]';

B1 = [1 5 10]';

C1 = [-17 -11 -2]';

group = repelem((1:3)',[numel(A1);numel(B1);numel(C1)]);

h1=boxplot([A1; B1; C1],group,'colors','b','widths',0.15,'BoxStyle','filled');

lines = findobj(gcf, 'type', 'line', 'Tag', 'Median');

set(lines, 'Color', 'g','LineWidth',2);

hold on

xMed = mean(vertcat(lines.XData),2); % n x 1

yMed = vertcat(lines.YData); % n x 2 (duplicate columns)

plot(xMed, yMed(:,1), 'ro-')