[Numpy-discussion] bitwise or'ing rows

[Jaime Fernández del Río]

On Tue, Apr 4, 2017 at 9:14 AM, Mads Ipsen <mads.ipsen at gmail.com> wrote:

> Hi
>
> If I have an n x m array of bools, is there a handy way for me to perform
> a 'bitwise_and' or 'bitwise_or' along an axis, for example all the rows or
> all the columns? For example
>
> a =
> [[1,0,0,0],
>  [0,0,1,0],
>  [0,0,0,0]] (0 and 1 meaning True and False)
>
> a.bitwise_or(axis=0)
>
> giving
>
> [1,0,1,0]
>

I think what you want is equivalent to np.all(a, axis=0) for bitwise_and
and np.any(a, axis=0) for bitwise_or.

You can also use the more verbose np.bitwise_and.reduce(a, axis=0) and
np.bitwise_or.reduce(a, axis=0).

Jaime


>
> Best regards,
>
> Mads
>
>
>
>
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