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BUG: MaskedArray _optinfo dictionary is not updated when calling __eq__/__ne__ #9279

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BUG: MaskedArray _optinfo dictionary is not updated when calling __eq__/__ne__ #9279

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1 change: 1 addition & 0 deletions numpy/ma/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3956,6 +3956,7 @@ def _comparison(self, other, compare):
mask = np.broadcast_to(mask, check.shape).copy()

check = check.view(type(self))
check._update_from(self)
check._mask = mask
return check

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21 changes: 21 additions & 0 deletions numpy/ma/tests/test_core.py
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Expand Up @@ -691,6 +691,27 @@ def test_optinfo_propagation(self):
y._optinfo['info'] = '!!!'
assert_equal(x._optinfo['info'], '???')


def test_optinfo_forward_propagation(self):
a = array([1,2,2,4])
a._optinfo["key"] = "value"
assert_equal(a._optinfo["key"], (a == 2)._optinfo["key"])
assert_equal(a._optinfo["key"], (a != 2)._optinfo["key"])
assert_equal(a._optinfo["key"], (a > 2)._optinfo["key"])
assert_equal(a._optinfo["key"], (a >= 2)._optinfo["key"])
assert_equal(a._optinfo["key"], (a <= 2)._optinfo["key"])
assert_equal(a._optinfo["key"], (a + 2)._optinfo["key"])
assert_equal(a._optinfo["key"], (a - 2)._optinfo["key"])
assert_equal(a._optinfo["key"], (a * 2)._optinfo["key"])
assert_equal(a._optinfo["key"], (a / 2)._optinfo["key"])
assert_equal(a._optinfo["key"], a[:2]._optinfo["key"])
assert_equal(a._optinfo["key"], a[[0,0,2]]._optinfo["key"])
assert_equal(a._optinfo["key"], np.exp(a)._optinfo["key"])
assert_equal(a._optinfo["key"], np.abs(a)._optinfo["key"])
assert_equal(a._optinfo["key"], array(a, copy=True)._optinfo["key"])
assert_equal(a._optinfo["key"], np.zeros_like(a)._optinfo["key"])


def test_fancy_printoptions(self):
# Test printing a masked array w/ fancy dtype.
fancydtype = np.dtype([('x', int), ('y', [('t', int), ('s', float)])])
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