Comment #1 on issue 1709 by smichr: separatevars fails if given an
expression with noncommutative symbols
http://code.google.com/p/sympy/issues/detail?id=1709
>>> from sympy import *
>>> n=Symbol('n', commutative=False)
>>> x=Symbol('x')
>>> separatevars(x+x*n)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\simplify\simplify.py", line 721, in separatevars
return _separatevars(expr)
File "sympy\simplify\simplify.py", line 727, in _separatevars
expr = factor(expr)
File "sympy\polys\factortools.py", line 80, in factor
coeff, factors = poly_factors(f, *symbols, **flags)
File "sympy\polys\factortools.py", line 20, in poly_factors
f = Poly(f, *symbols)
File "sympy\polys\polynomial.py", line 363, in __new__
raise SymbolsError("Non-commutative symbols: %s" % (symbols,))
sympy.polys.polynomial.SymbolsError: Non-commutative symbols: (n, x)
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