BUG: fix ma.minimum.reduce with axis keyword#21993
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Adapted from the problem reported at numpy#21977 (comment)
Fixes the problem reported at numpy#21977 (comment) The reduce method here effectively calls itself with an unmasked MaskedArray (mask=nomask) and then expects either a MaskedArray or a scalar. This change ensures that an ordinary ndarray is converted to a MaskedArray, following the pattern already used in mean and var in this module.
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This was referenced Jul 18, 2022
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Fixes the problem reported at #21977 (comment).
The
reducemethod here effectively calls itself with an unmaskedMaskedArray(mask=nomask) and then expects either aMaskedArrayor a scalar. This change ensures that an ordinaryndarrayis converted to aMaskedArray, following the pattern already used inmeanandvarin this module.When
twas anndarray, we calledelif mon a boolean array, triggering the "ambiguous truth value" error.numpy/numpy/ma/core.py
Lines 6883 to 6886 in bdec321