[Numpy-discussion] Sum over array elements

Gökhan Sever gokhansever@gmail....
Mon Apr 12 09:26:19 CDT 2010


On Mon, Apr 12, 2010 at 9:21 AM, Nicola Creati <ncreati@inogs.it> wrote:

> Hello,
> I want to calculate, given a one dimension array, the sum over every two
> elements of the array.
> I found this working solution:
>
> a = N.arange(10)
> b = a.reshape(a, (5, 2))
> c = b.sum(axis=1)
>
> Is there any better solution?
>
> Thanks,
>
> Nicola Creati
>
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Sum odds and evens:

I[3]: d = a[1::2] + a[::2]

I[4]: d
O[4]: array([ 1,  5,  9, 13, 17])

-- 
Gökhan
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