[Numpy-discussion] Vectorizing array updates
Wed Apr 29 16:19:32 CDT 2009
Robert Kern wrote:
> On Wed, Apr 29, 2009 at 08:03, Daniel Yarlett <email@example.com> wrote:
>> As you can see, Current is different in the two cases. Any ideas how I
>> can recreate the behavior of the iterative process in a more numpy-
>> friendly, vectorized (and hopefully quicker) way?
> Use bincount().
Neat. Is there a memory efficient way of doing it if the indices are
very large but there aren't many of them? e.g. if the indices were
I=[10000, 20000] then bincount would create a gigantic array of 20000
elements for just two addition operations!
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