diff options
Diffstat (limited to 'numpy/lib')
| -rw-r--r-- | numpy/lib/arraysetops.py | 4 | ||||
| -rw-r--r-- | numpy/lib/tests/test_arraysetops.py | 11 |
2 files changed, 14 insertions, 1 deletions
diff --git a/numpy/lib/arraysetops.py b/numpy/lib/arraysetops.py index 7600e17be..bd56b6975 100644 --- a/numpy/lib/arraysetops.py +++ b/numpy/lib/arraysetops.py @@ -339,7 +339,9 @@ def _unique1d(ar, return_index=False, return_inverse=False, aux_firstnan = np.searchsorted(np.isnan(aux), True, side='left') else: aux_firstnan = np.searchsorted(aux, aux[-1], side='left') - mask[1:aux_firstnan] = (aux[1:aux_firstnan] != aux[:aux_firstnan - 1]) + if aux_firstnan > 0: + mask[1:aux_firstnan] = ( + aux[1:aux_firstnan] != aux[:aux_firstnan - 1]) mask[aux_firstnan] = True mask[aux_firstnan + 1:] = False else: diff --git a/numpy/lib/tests/test_arraysetops.py b/numpy/lib/tests/test_arraysetops.py index d62da9efb..13385cd24 100644 --- a/numpy/lib/tests/test_arraysetops.py +++ b/numpy/lib/tests/test_arraysetops.py @@ -610,6 +610,17 @@ class TestUnique: assert_equal(np.unique(a, return_inverse=True), (ua, ua_inv)) assert_equal(np.unique(a, return_counts=True), (ua, ua_cnt)) + # test for gh-19300 + all_nans = [np.nan] * 4 + ua = [np.nan] + ua_idx = [0] + ua_inv = [0, 0, 0, 0] + ua_cnt = [4] + assert_equal(np.unique(all_nans), ua) + assert_equal(np.unique(all_nans, return_index=True), (ua, ua_idx)) + assert_equal(np.unique(all_nans, return_inverse=True), (ua, ua_inv)) + assert_equal(np.unique(all_nans, return_counts=True), (ua, ua_cnt)) + def test_unique_axis_errors(self): assert_raises(TypeError, self._run_axis_tests, object) assert_raises(TypeError, self._run_axis_tests, |