Updates:
Status: Valid
Comment #1 on issue 4089 by [email protected]: Matrix object does not
accept being summed when inside a list and using built-in sum()
http://code.google.com/p/sympy/issues/detail?id=4089
It's because sum(s) results in 0 + s[0] + s[1] + s[2].
But try this patch:
diff --git a/sympy/matrices/matrices.py b/sympy/matrices/matrices.py
index ab16975..d74dad9 100644
--- a/sympy/matrices/matrices.py
+++ b/sympy/matrices/matrices.py
@@ -575,6 +575,8 @@ def __add__(self, other):
for i in range(A.shape[0]):
ret[i] = list(map(lambda j, k: j + k, alst[i], blst[i]))
return classof(A, B)._new(ret)
+ if S(other).is_zero:
+ return self
raise TypeError('cannot add matrix and %s' % type(other))
def __radd__(self, other):
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