[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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