[Numpy-discussion] interleaving arrays

Emmanuelle Gouillart emmanuelle.gouillart@normalesup....
Sun Jun 14 09:21:43 CDT 2009


a = np.empty(3*n.size, np.int)
a[::3]=n
a[1::3]=m
a[2::3]=o

or 
np.array(zip(n,m,o)).ravel()

but the first solution is faster, even if you have to write more :D 

Emmanuelle



On Sun, Jun 14, 2009 at 04:11:29PM +0200, Robert wrote:
> whats the right way to efficiently weave arrays like this ? :

>  >>> n
> array([1, 2, 3, 4])
>  >>> m
> array([11, 22, 33, 44])
>  >>> o
> array([111, 222, 333, 444])


> =>

> [  1,  11, 111,   2,  22, 222,   3,  33, 333,   4,  44, 444]

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