Converting python objects for rpy2

by

You need to add 

import rpy2.robjects.numpy2ri
rpy2.robjects.numpy2ri.activate()

See more in rpy2 documentation numpy section (here for the older 2.x version)

Prior to 2.2.x the import alone was sufficient.

That import alone is sufficient to
switch an automatic conversion of
numpy objects into rpy2 objects.

Why make this an optional import,
while it could have been included in
the function py2ri() (as done in the
original patch submitted for that
function) ?

Although both are valid and reasonable
options, the design decision was taken
in order to decouple rpy2 from numpy
the most, and do not assume that
having numpy installed automatically
meant that a programmer wanted to use
it.

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