[Numpy-discussion] np.vstack vs. np.stack

Robert Kern robert.kern at gmail.com
Thu Nov 9 14:20:26 EST 2017

On Thu, Nov 9, 2017 at 1:30 AM, Joe <solarjoe at posteo.org> wrote:
> Hello,
> I have a question and hope that you can help me.
> The doc for vstack mentions that "this function continues to be supported
for backward compatibility, but you should prefer np.concatenate or
> Using vstack was convenient because "the arrays must have the same shape
along all but the first axis."
> So it was possible to stack an array (3,) and (2, 3) to a (3, 3) array
without using e.g. atleast_2d on the (3,) array.
> Is there a possibility to mimic that behavior with np.concatenate or

Quite frankly, I ignore the documentation as I think it's recommendation is
wrong in these cases. Vive la vstack!

Robert Kern
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