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BUG: masked structured arrays cannot be compared to their unmasked counterparts #24554

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mhvk opened this issue Aug 26, 2023 · 0 comments · Fixed by #24556
Closed

BUG: masked structured arrays cannot be compared to their unmasked counterparts #24554

mhvk opened this issue Aug 26, 2023 · 0 comments · Fixed by #24556
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00 - Bug component: numpy.ma masked arrays

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@mhvk
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mhvk commented Aug 26, 2023

Describe the issue:

A structured masked array can be compared to another, but not to an unstructured one, since then the absence of a mask is not treated correctly (I fear in code I wrote, very weird that this was not found earlier and not already tested!).

Reproduce the code example:

import numpy as np
a = np.array([(1., 2.), (3., 4.)], "f8,f8")
ma = np.ma.MaskedArray(a)
ma == ma
# masked_array(data=[True, True],
#              mask=[False, False],
#        fill_value=True)
ma == a
# TypeError: Cannot compare structured or void to non-void arrays.

Error message:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/numpy/ma/core.py", line 4161, in __eq__
    return self._comparison(other, operator.eq)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/numpy/ma/core.py", line 4129, in _comparison
    check = np.where(mask, compare(smask, omask), check)
                           ^^^^^^^^^^^^^^^^^^^^^
TypeError: Cannot compare structured or void to non-void arrays.

Runtime information:

1.24.2
3.11.4 (main, Jun 7 2023, 10:13:09) [GCC 12.2.0]

Context for the issue:

No response
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BUG: fix comparisons between masked and unmasked structured arrays mhvk/numpy
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@charris @mhvk