Vincent Nijs (el 2007-07-22 a les 10:21:18 -0500) va dir::

> [...]
> I would assume the NULL's could be treated as missing values (?) Don't know
> about the different types in one column however.

Maybe a masked array would do the trick, with NULL values masked out.

::

        Ivan Vilata i Balaguer   >qo<   http://www.carabos.com/
               Cárabos Coop. V.  V  V   Enjoy Data
                                  ""

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