[Numpy-discussion] A minor clarification no why count_nonzero is faster for boolean arrays

Jaime Fernández del Río jaime.frio at gmail.com
Thu Dec 17 17:02:04 EST 2015


On Thu, Dec 17, 2015 at 7:37 PM, CJ Carey <perimosocordiae at gmail.com> wrote:

> I believe this line is the reason:
>
> https://github.com/numpy/numpy/blob/c0e48cfbbdef9cca954b0c4edd0052e1ec8a30aa/numpy/core/src/multiarray/item_selection.c#L2110
>

The magic actually happens in  count_nonzero_bytes_384, a few lines before
that (line 1986).

Jaime

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