indexing with arrays of indexes and +=

David Huard david.huard at
Tue Oct 24 15:46:54 CDT 2006

2006/10/24, Vincent Schut <schut at>:
> It is clear to me that the numpy += operator in combination with the use
> of arrays of indexes, as is explained in the Tentative Numpy Tutorial
> (
> ),
> the limitation being that indexes that appear more than 1 time in the
> indexes-array will get incremented only once.
> Does anybody know a way to work around this?

I am using this to fill up a custom nd-histogram, and obviously each bin
> should be able to get incremented more than once. Looping over the
> entire array and incrementing each bin succesively takes waaay to long
> (these are pretty large arrays, like 4000x2000 items, or even larger)
I don't know the answer to the first question, but I'd like to ask if you
tried histogramdd ? If its lacking some features, i'd be willing to
implement them.

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