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

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Yazan on 13 Jul 2021
Commented: Yazan on 15 Jul 2021
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);
boxplot(x1, 'Positions', 1);
hold on
boxplot(x2, 'Positions', 2);
% only one box is shown

Accepted Answer

Ive J
Ive J on 13 Jul 2021
Edited: Ive J on 13 Jul 2021
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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