Anyone using numpy from Sage should beware of the following:
sage: import numpy
sage: m = numpy.matrix([[1,2],[3,4]])
sage: m[:,0]
matrix([[1, 3]])
sage: m[:,int(0)]
matrix([[1],
[3]])
That is, if you use a Sage integer to index a numpy matrix, you don't
get the expected shape back. I know exactly why this happens --
http://trac.sagemath.org/sage_trac/ticket/10928 -- but ideally it
should be patched upstream.
Doug
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