How to use box plots for irregular x-axis intervals?

I would like to use box plots for data that are collected at irregular time intervals. How can I plot multiple boxes at specific x-locations instead of just having them regularly spaced?

Thanks.

[Dawn]

Thanks everyone. After trying out some, the following code works for me. It takes care of plotting data sets of different sizes and plotting them at irregular x-intervals.

x = rand(5,1); y = rand(10,1); z = rand(15,1); Xpos = [1 5 12];

group = [repmat(Xpos(1), 5, 1); repmat(Xpos(2), 10, 1); repmat(Xpos(3), 15, 1)];

boxplot([x;y;z], group,'positions', Xpos, 'labels', Xpos)

Answer 1

[dpb]

While I've not used it, the optional GROUPING input variable should suffice in conjunction with the 'positions' named parameter. See the doc for details...there are a couple of examples of doing so it appears.

Answer 2

[José-Luis]

You can't. At least not if you use the boxplot() function. You'd have to create your own variant. Alternatively you could create dummy data at regular timesteps and make them transparent.

[dpb]

So, since it led to the solution, accept the answer???