How can I compute multiple boxplots with vectors of different length using the Statistics Toolbox 4.0 (R13)?

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MathWorks Support Team on 27 Jun 2009

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https://www.mathworks.com/matlabcentral/answers/93785-how-can-i-compute-multiple-boxplots-with-vectors-of-different-length-using-the-statistics-toolbox-4

Edited: MathWorks Support Team on 22 Feb 2022

The current BOXPLOT function in the Statistics Toolbox only allows me to plot column vectors of the same length. For example:

A = [x,y,z]
boxplot(A)

Note that x, y and z must be the same length to successfully run the above example. Is there any way to do this if x, y, and z are of different lengths?

For example:

x = rand(1,5);
y = rand(1,10);
z = rand(1,15);

How can I create three boxplots on the same figure window?

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Answer 1

MathWorks Support Team on 27 Jun 2009

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https://www.mathworks.com/matlabcentral/answers/93785-how-can-i-compute-multiple-boxplots-with-vectors-of-different-length-using-the-statistics-toolbox-4#answer_103136

The BOXPLOT function allows a grouping argument that allows you plot multiple boxplot on the same figure window. Here is the code to do this:

x = rand(5,1);
y = rand(10,1);
z = rand(15,1);
group = [repmat({'First'}, 5, 1); repmat({'Second'}, 10, 1); repmat({'Third'}, 15, 1)];
boxplot([x;y;z], group)

2 Comments
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Cam Salzberger on 18 Mar 2016

Replace every instance of x, y, or z with your own data variables.

Michael Abboud on 31 Jul 2017

Edited: MathWorks Support Team on 22 Feb 2022

The boundaries of the box are set at the 25th and 75th percentiles as this is considered standard. The maximum whisker length, however, can be set using the following property:

https://www.mathworks.com/help/stats/boxplot.html

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