[Numpy-discussion] histogram2d error with empty inputs

[Benjamin Root]

On Wednesday, July 6, 2011, Ralf Gommers <ralf.gommers at googlemail.com> wrote:
>
>
> On Mon, Jun 27, 2011 at 9:38 PM, Benjamin Root <ben.root at ou.edu> wrote:
>
> I found another empty input edge case.  Somewhat recently, we fixed an issue with np.histogram() and empty inputs (so long as the bins are somehow known).
>
>>>> np.histogram([], bins=4)
> (array([0, 0, 0, 0]), array([ 0.  ,  0.25,  0.5 ,  0.75,  1.  ]))
>
> However, histogram2d needs the same treatment.
>
>>>> np.histogram([], [], bins=4)
> (array([ 0.,  0.]), array([ 0.  ,  0.25,  0.5 ,  0.75,  1.  ]), array([ 0.  ,  0.25,  0.5 ,  0.75,  1.  ]))
>
> The first element in the return tuple needs to be 4x4 (in this case).
>
> Could you open a ticket for this?
>
> Ralf
>
>
>

Not a problem.  I managed to partly trace the problem down into
histogramdd, but the function is a little confusing.

Ben Root