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Message from discussion Fast Cython searchsorted for both arrays sorted
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Keith Goodman  
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 More options Jun 4 2012, 3:19 pm
From: Keith Goodman <kwgood...@gmail.com>
Date: Mon, 4 Jun 2012 12:19:02 -0700
Local: Mon, Jun 4 2012 3:19 pm
Subject: Re: Fast Cython searchsorted for both arrays sorted
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> ---------- Forwarded message ----------
> From: Tom Aldcroft
> Date: Mon, Jun 4, 2012 at 2:13 PM
> Subject: Fast Cython searchsorted for both arrays sorted
> To: bottle-neck@googlegroups.com

> I just saw the announce for bottleneck 0.6.  This looks really useful!
>  By coincidence this weekend I wrote a little Cython code to replace
> np.searchsorted(a, v) for the special case when both arrays are
> sorted.  When this is the case and len(v) > len(a) / 100 (roughly
> speaking) then the Cython version is 10 to 20 times faster.  This use
> case is pretty common in my work, for instance in regridding
> coordinate data etc.  Here is the code, first the Cython code and then
> the Python wrapper function:

> https://github.com/sot/Ska.Numpy/blob/master/Ska/Numpy/fastss.pyx
> https://github.com/sot/Ska.Numpy/blob/master/Ska/Numpy/Numpy.py#L427

Nice. I opened an issue: https://github.com/kwgoodman/bottleneck/issues/47

 
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