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ENH: Adding __array_ufunc__ capability to MaskedArrays #21977

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Merged
merged 4 commits into from
Jul 14, 2022
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ENH: Adding __array_ufunc__ capability to MaskedArrays #21977

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8cd6f4c
ENH: Adding __array_ufunc__ capability to MaskedArrays.
greglucas Apr 15, 2020
a8b0893
TST: Adding a test that MaskedArrays respect ufunc deferral heirarchy
greglucas Jul 9, 2020
fe8b171
DOC: Adding improvement note for MaskedArray ufunc
greglucas Apr 14, 2021
db1a98b
nomask in nomask out
rcomer Jul 13, 2022
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9 changes: 9 additions & 0 deletions doc/release/upcoming_changes/16022.improvement.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
MaskedArray gains a ``__array_ufunc__`` method to better handle ufuncs
----------------------------------------------------------------------
The MaskedArray class now has an implementation of `__array_ufunc__` that
handles deferrals to the desired implementations of the ufunc. If a masked
implementation of a ufunc exists, that implementation will take priority.
This means that code called with MaskedArray ma as ``np.ufunc(ma)`` will
behave the same as ``np.ma.ufunc(ma)``. Additionally, adding this helps with
dispatching to subclasses and preserving the proper types when another
implementation should take priority.
2 changes: 1 addition & 1 deletion numpy/lib/tests/test_function_base.py
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Expand Up @@ -780,7 +780,7 @@ def test_subclass(self):
mask=[[False, False], [True, False],
[False, True], [True, True], [False, False]])
out = diff(x)
assert_array_equal(out.data, [[1], [1], [1], [1], [1]])
assert_array_equal(out.data, [[1], [4], [6], [8], [1]])
assert_array_equal(out.mask, [[False], [True],
[True], [True], [False]])
assert_(type(out) is type(x))
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