How to plot box plots of data of different sizes on the same figure?

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Yazan 2021-7-13

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评论： Yazan 2021-7-15

采纳的回答： Ive J

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Hi everyone!

I have vectors of variable sizes in a cell array. I need to plot the box plot of each vector on the same figure. The Matlab function boxplot accepts only a matrix as an input, meaning that I cannot plot all the boxes together by passing a cell array. Also, it doesn't work if I hold the axes and plot the boxes one by one at different positions. A simple code is below to help you understand the issue.

x1 = randn(128, 1);
x2 = randn(100, 1);
figure
boxplot(x1, 'Positions', 1);
hold on
boxplot(x2, 'Positions', 2);
% only one box is shown

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采纳的回答

Ive J 2021-7-13

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编辑：Ive J 2021-7-13

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You just need to define a grouping array:

x1 = randn(128, 1);

x2 = randn(100, 1);

X = [x1; x2];

grp = [ones(size(x1)); 2.*ones(size(x2))];

boxplot(X, grp)

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Ive J 2021-7-14

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After checking again the boxplot behavior, I guess there is a workaround to avoid this grouping:

x1 = randn(128, 1);

x2 = randn(100, 1);

ax = gca;

hold on

boxplot(ax, x1, 'Position', 1)

boxplot(ax, x2, 'Position', 2)

hold off

% modify XLim and YLim so that the axis covers both datasets.

ax.XLim = [0.5, 2.5]; % Make sure that ax XLim covers both

YLimCoeff = 1.1;

ax.YLim = [YLimCoeff*min([x1(:); x2(:)]), YLimCoeff*max([x1(:); x2(:)])]; % so, even if x1 and x2 come from different sources, by now, both are available

% modify XTick: current axis only has the tick value for the second boxplot

ax.XTick = [1, 2];

ax.XTickLabel = string(ax.XTick);