Box plot problem - mismatched arrays

I have a simple, but frustrating problem.

I need to plot a number of series onto a boxplot. Some sample
code looks as follows:

from pylab import *
from scipy import array
jan = array([46, 38, 28, 14, 11, 7, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1])
#jan = array([46, 38, 28, 14, 11, 7, 4, 3, 3, 3, 3, 3]) #this length
works!!
feb = array([ 2, 12, 3, 3, 13, 10, 17, 6, 6, 6, 3, 3])
jan.shape = (-1, 1)
feb.shape = (-1, 1)
series = concatenate( (jan, feb), 1 )
figure()
boxplot(series,1)
show()

(In Real Life, of course, the data arrays are built up elsewhere
and passed into the plotting function...)

The problem is that I get the error:
ValueError: array dimensions must agree except for d_0

because jan and feb have different lengths - however, I have no
control
over the size of these arrays - they vary greatly according to
external
issues.

How do I plot multiple. variable-length array on the same boxplot?

Thanks
Derek

ยทยทยท

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