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-rw-r--r--numpy/lib/shape_base.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/numpy/lib/shape_base.py b/numpy/lib/shape_base.py
index 65104115a..d31d8a939 100644
--- a/numpy/lib/shape_base.py
+++ b/numpy/lib/shape_base.py
@@ -536,7 +536,11 @@ def expand_dims(a, axis):
True
"""
- a = asarray(a)
+ if isinstance(a, matrix):
+ a = asarray(a)
+ else:
+ a = asanyarray(a)
+
shape = a.shape
if axis > a.ndim or axis < -a.ndim - 1:
# 2017-05-17, 1.13.0