Comment #2 on issue 3070 by [email protected]: cse raises error with RootOf
http://code.google.com/p/sympy/issues/detail?id=3070
This might be the same thing:
z
-sqrt(2*sqrt(5) + 10)/4 - sqrt(5)*sqrt(2*sqrt(5) + 10
)/20 + sqrt(5)*sqrt(2*sqrt(5) + 5)/5
solve(z.subs(sqrt(5),x)-1)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\solvers\solvers.py", line 826, in solve
solution = _solve(f[0], *symbols, **flags)
File "sympy\solvers\solvers.py", line 1336, in _solve
result = map(simplify, result)
File "sympy\simplify\simplify.py", line 3418, in simplify
expr = signsimp(expr)
File "sympy\simplify\simplify.py", line 3274, in signsimp
e = sub_post(sub_pre(expr))
File "sympy\simplify\cse_opts.py", line 31, in sub_pre
e = e.xreplace(negs)
File "sympy\core\basic.py", line 1052, in xreplace
return self.func(*args)
File "sympy\polys\rootoftools.py", line 67, in __new__
(-degree, degree - 1, index))
IndexError: root index out of [-1, 0] range, got 1
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