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-rw-r--r--numpy/lib/polynomial.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/numpy/lib/polynomial.py b/numpy/lib/polynomial.py
index ca61e34a3..f8bc1f693 100644
--- a/numpy/lib/polynomial.py
+++ b/numpy/lib/polynomial.py
@@ -383,6 +383,7 @@ def polymul(a1, a2):
"""Multiplies two polynomials represented as sequences.
"""
truepoly = (isinstance(a1, poly1d) or isinstance(a2, poly1d))
+ a1,a2 = poly1d(a1),poly1d(a2)
val = NX.convolve(a1, a2)
if truepoly:
val = poly1d(val)