[Numpy-discussion] Numpy where

Charles R Harris charlesr.harris at gmail.com
Thu Mar 12 20:02:25 EDT 2015

Hi All,

This is apropos gh-5582 <https://github.com/numpy/numpy/pull/5582> dealing
with some corner cases of np.where. The following are the current behavior

>>> import numpy
>>> numpy.where(True)  # case 1
... (array([0]),)
>>> numpy.where(True, None, None)  # case 2
... array(None, dtype=object)
>>> numpy.ma.where(True)  # case 3
... (array([0]),)
>>> numpy.ma.where(True, None, None)  # case 4
... (array([0]),)

The question is, what exactly should be done in these cases? I'd be
inclined to raise an error for cases 1 and 3. Case two looks correct to me
if we agree that scalar inputs are acceptable. Case 4 looks wrong.


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