Merge pull request #20663 from mdhaber/gh20661

MAINT: stats.kruskal: fix no-arg behavior w/ SCIPY_ARRAY_API=1
scipy · May 8, 2024 · 17a3aa0 · 17a3aa0
2 parents eb6156b + 8fde6e2
commit 17a3aa0
Show file tree

Hide file tree

Showing 2 changed files with 7 additions and 0 deletions.
diff --git a/scipy/stats/_axis_nan_policy.py b/scipy/stats/_axis_nan_policy.py
@@ -16,6 +16,8 @@ def _broadcast_arrays(arrays, axis=None, xp=None):
     """
     Broadcast shapes of arrays, ignoring incompatibility of specified axes
     """
+    if not arrays:
+        return arrays
     xp = array_namespace(*arrays) if xp is None else xp
     arrays = [xp.asarray(arr) for arr in arrays]
     shapes = [arr.shape for arr in arrays]

diff --git a/scipy/stats/tests/test_stats.py b/scipy/stats/tests/test_stats.py
@@ -7679,6 +7679,11 @@ def test_large_no_samples(self):
         expected = 0
         assert_approx_equal(p, expected)
 
+    def test_no_args_gh20661(self):
+        message = r"Need at least two groups in stats.kruskal\(\)"
+        with pytest.raises(ValueError, match=message):
+            stats.kruskal()
+
 
 class TestCombinePvalues: