[Numpy-discussion] quickselect

Julian Taylor jtaylor.debian@googlemail....
Tue Jun 11 17:32:53 CDT 2013


On 11.06.2013 14:37, Jonathan J. Helmus wrote:
>
> 
> Julian,
> 
> 
> Since I am the author of the current percentile PR
> (https://github.com/numpy/numpy/pull/2970), I'm willing to try
> reimplementing percentile with the new partition functionality.  I
> don't expect to have time to do this until the Scipy conference in
> two week, so if anyone else wants to give the implementation a try
> please feel free.  Julian will you be at Scipy this year if I have
> any questions?

I wont be at the Scipy in June, but I can be reached via email or IRC
(jtaylor on freenode and oftc) in the evening (UTC).

btw. you don't need the minimum "trick" currently used in the branch for
even element medians any more, so don't copy it for percentile.
partition is specialized for small kth elements to be almost as fast as
minimum, sometimes even faster if iterative partitioning is used (e.g.
np.partition(d, (mid, mid + 1)))


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