Add example same correlation in pandas.Series.corr documentation (#59591

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pandas-dev · Aug 25, 2024 · dca2635 · dca2635
1 parent 631ab35
commit dca2635
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/pandas/core/series.py b/pandas/core/series.py
@@ -2619,6 +2619,13 @@ def corr(
         >>> s2 = pd.Series([1, 2, 3], index=[2, 1, 0])
         >>> s1.corr(s2)
         -1.0
+
+        If the input is a constant array, the correlation is not defined in this case,
+        and ``np.nan`` is returned.
+
+        >>> s1 = pd.Series([0.45, 0.45])
+        >>> s1.corr(s1)
+        nan
         """  # noqa: E501
         this, other = self.align(other, join="inner")
         if len(this) == 0: