[SciPy-User] Filtering record arrays by contents of columns using `ismember`-like syntax

[Chris Rodgers]

Thanks to everyone for their comments!

Concerning the speed of numpy.in1d: my guess is that in1d works best
for arrays of comparable size, and this method works best for the
special case when one array contains just a few values. I suppose it
might make sense for me to break this into two objects. The first
would replicate in1d for this use case. The second would supply the
syntactic simplification for filtering.

Concerning the use of PyTables: I definitely agree that is the answer
for complex queries. I see this object as solving a narrow slice of
problems between the complex (PyTables) and the trivially simple
(explicit mask). For whatever reason a lot of my actual day-to-day
problems fall into that category. Probably because I'm porting this
code from Matlab and that's just the Matlab way of thinking about
things.


> Just create an appropriate ticket with code, docstring, examples and
> test cases. :-)
> At least then it would not get lost in the email archives.

I'm happy to do that, though having never done this, I'm not sure
where is "appropriate" (scipy trac, numpy trac, Cookbook, etc...)