[Numpy-discussion] Emulate left outer join?
David Carmean
dlc@halibut....
Wed Feb 10 04:08:54 CST 2010
On Tue, Feb 09, 2010 at 04:49:30PM -0600, John Hunter wrote:
> On Tue, Feb 9, 2010 at 4:43 PM, Fernando Perez <fperez.net@gmail.com> wrote:
> > On Tue, Feb 9, 2010 at 5:02 PM, Robert Kern <robert.kern@gmail.com> wrote:
> >>
> >> numpy.lib.recfunctions.join_by(key, r1, r2, jointype='leftouter')
> >>
> >
> > And if that isn't sufficient, John has in matplotlib.mlab a few other
> > similar utilities that allow for more complex cases:
>
> The numpy.lib.recfunctions were ported from matplotlib.mlab so most of
> the functionality is overlapping, but we have added some stuff since
> the port, eg matplotlib.mlab.recs_join for a multiway join, and some
> stuff was never ported (rec_summarize, rec_groupby) so it may be worth
> looking in mlab too. Some of the stuff for mpl is only in svn but
> most of it is released.
>
> Examples are at
>
> http://matplotlib.sourceforge.net/examples/misc/rec_join_demo.html
> http://matplotlib.sourceforge.net/examples/misc/rec_groupby_demo.html
Thank you; this appears to be one of those packages where a good bit of
the documentation is in the mailing list :) Or waiting in the typing fingers
of the experts for somebody like me to ask at the right time :)
Someday perhaps I'll find the time to go through the code and
learn what else is there that's not in the pdf book.
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