[Numpy-discussion] repeat array in a fake dim without stride_tricks ?
sebastian at sipsolutions.net
Fri Dec 13 07:45:37 EST 2013
On Thu, 2013-12-12 at 15:20 +0100, Pierre Haessig wrote:
> In order to repeat rows or columns of an array as
> I can use np.repeat as suggested by pv. However, looking at the flags of
> the resulting array, data seems to be copied and actually repeated in
> memory. This is not applicable if want a 1000x repetition.
> What are the other options for such a repeat ?
No, I don't think there are any other options. stride tricks are a bit
hidden, since in many cases it is more dangerous than helping.
Though with some care you can easily implement such functions using
> On scipy lectures, there is a suggestion to use as_strided :
> Otherwise, I see broadcast_arrays :
> > N = 3
> > data = np.arange(N)
> > np.broadcast_arrays(data[:,None], np.zeros((1,2)))
> array([[0, 0],
> [1, 1],
> [2, 2]])
> This works but it feels like invoking a magic formula. Did I miss a
> simpler function ?
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