8000 masked-array median of array should be scalar · Issue #7835 · numpy/numpy · GitHub
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larrybradley opened this issue Jul 14, 2016 · 1 comment
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masked-array median of array should be scalar #7835

larrybradley opened this issue Jul 14, 2016 · 1 comment
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00 - Bug component: numpy.ma masked arrays

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@larrybradley
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larrybradley commented Jul 14, 2016 •
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Related to #5969, #7592, #7635, #7654, I still find inconsistent behavior in numpy 1.11.1.
np.ma.median (with axis=None) returns a masked array instead of a scalar for all cases except when the input is a masked array that has a least one masked value. It's only for that case where a scalar is returned.

>>> data = np.arange(10)
>>> mask = np.zeros(10).astype(bool)
>>> np.ma.median(data)
masked_array(data = 4.5,
             mask = False,
       fill_value = 1e+20)

>>> np.ma.median(np.ma.masked_array(data, mask=False))
masked_array(data = 4.5,
             mask = False,
       fill_value = 1e+20)

>>> np.ma.median(np.ma.masked_array(data, mask=mask))
masked_array(data = 4.5,
             mask = False,
       fill_value = 1e+20)

>>> mask[0] = True
>>> np.ma.median(np.ma.masked_array(data, mask=mask))
5.0
@larrybradley larrybradley changed the title masked-array median of 1d array should be scalar masked-array median of array should be scalar Jul 14, 2016
@charris charris added this to the 1.11.2 release milestone Jul 20, 2016
@skwbc skwbc mentioned this issue Aug 6, 2016
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@ahaldane ahaldane closed this as completed Aug 8, 2016
@ahaldane
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ahaldane commented Aug 8, 2016

Fixed by #7911

@larrybradley larrybradley mentioned this issue Aug 11, 2016
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00 - Bug component: numpy.ma masked arrays
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