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BUG: np.matmul with Index raising TypeError #57079

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Merged
merged 2 commits into from
Jan 29, 2024
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BUG: np.matmul with Index raising TypeError #57079

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BUG: np.matmul with Index raising TypeError
mroeschke Jan 26, 2024
5de0ee5
Add whatsnew number
mroeschke Jan 26, 2024
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v3.0.0.rst
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Expand Up @@ -142,7 +142,7 @@ Timezones

Numeric
^^^^^^^
-
- Bug in ``np.matmul`` with :class:`Index` inputs raising a ``TypeError`` (:issue:`57079`)
-

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3 changes: 3 additions & 0 deletions pandas/core/indexes/base.py
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Expand Up @@ -951,6 +951,9 @@ def __array_ufunc__(self, ufunc: np.ufunc, method: str_t, *inputs, **kwargs):
elif method == "reduce":
result = lib.item_from_zerodim(result)
return result
elif is_scalar(result):
# e.g. matmul
return result

if result.dtype == np.float16:
result = result.astype(np.float32)
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7 changes: 7 additions & 0 deletions pandas/tests/series/test_ufunc.py
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Expand Up @@ -427,6 +427,13 @@ def test_np_matmul():
tm.assert_frame_equal(expected, result)


@pytest.mark.parametrize("box", [pd.Index, pd.Series])
def test_np_matmul_1D(box):
result = np.matmul(box([1, 2]), box([2, 3]))
assert result == 8
assert isinstance(result, np.int64)


def test_array_ufuncs_for_many_arguments():
# GH39853
def add3(x, y, z):
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