boxplot - different group sizes

I would like to create a boxplot showing multiple groups, each of which has a different number of observations. How do I do this?

Answer 1

[Oleg Komarov]

Say you have:

A = rand(20,1);

and you want the first 5 value to be for one group, then the rest 15 for the second. Create and index with five 1s and fifteen 2s:

 G = [ones(5,1); repmat(2,15,1)];

 boxplot(A,G)

For details read carefully the documentation.

[Matt Tearle]

In particular, look at the 'factorgap' and 'positions' properties, for grouping by location.