[Numpy-discussion] Change in behavior of np.concatenate for upcoming release

Han Genuit hangenuit at gmail.com
Fri Sep 14 18:25:05 EDT 2012

I think there is something wrong with the implementation.. I would
expect each incoming array in PyArray_ConcatenateFlattenedArrays to be
flattened and the sizes of all of them added into a one-dimensional
shape. Now the shape is two-dimensional, which does not make sense to
me. Also the requirement that all sizes must be equal between the
incoming arrays only makes sense when you want to stack them into a
two-dimensional array, which makes it unnecessarily complicated. The
difficulty here is to use PyArray_CopyAsFlat without having to
transform/copy each incoming array to the priority dtype, because they
can have different item sizes between them, but other than that it
should be pretty straightforward, imo.

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