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-rw-r--r--numpy/lib/nanfunctions.py6
1 files changed, 4 insertions, 2 deletions
diff --git a/numpy/lib/nanfunctions.py b/numpy/lib/nanfunctions.py
index 02ad01a98..719c529c1 100644
--- a/numpy/lib/nanfunctions.py
+++ b/numpy/lib/nanfunctions.py
@@ -1010,10 +1010,12 @@ def _nanmedian_small(a, axis=None, out=None, overwrite_input=False):
for i in range(np.count_nonzero(m.mask.ravel())):
warnings.warn("All-NaN slice encountered", RuntimeWarning,
stacklevel=4)
+
+ fill_value = np.timedelta64("NaT") if m.dtype.kind == "m" else np.nan
if out is not None:
- out[...] = m.filled(np.nan)
+ out[...] = m.filled(fill_value)
return out
- return m.filled(np.nan)
+ return m.filled(fill_value)
def _nanmedian_dispatcher(