[Numpy-discussion] vstack and hstack performance penalty

[Sebastian Berg]

On Fri, 2014-01-24 at 06:13 -0800, Dinesh Vadhia wrote:
> When using vstack or hstack for large arrays, are there any
> performance penalties eg. takes longer time-wise or makes a copy of an
> array during operation ?

No, they all use concatenate. There are only constant overheads on top
of the necessary data copying. Though performance may vary because of
memory order, etc.

- Sebastian


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