It seems as though the symbolic integration process fails when it can't
find a solution:
integrate(sin(x**n),x)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"C:\SymPyWorkbook\lib\site-packages\sympy\integrals\integrals.py", line
1477, in integrate
return integral.doit(**doit_flags)
File
"C:\SymPyWorkbook\lib\site-packages\sympy\integrals\integrals.py", line
541, in doit
function, xab[0], **eval_kwargs)
File
"C:\SymPyWorkbook\lib\site-packages\sympy\integrals\integrals.py", line
1012, in _eval_integral
h = meijerint_indefinite(g, x)
File
"C:\SymPyWorkbook\lib\site-packages\sympy\integrals\meijerint.py", line
1621, in meijerint_indefinite
res = _meijerint_indefinite_1(f.subs(x, x + a), x)
File
"C:\SymPyWorkbook\lib\site-packages\sympy\integrals\meijerint.py", line
1684, in _meijerint_indefinite_1
if b < 0 or f.subs(x, 0).has(nan, zoo):
File "C:\SymPyWorkbook\lib\site-packages\sympy\core\relational.py",
line 304, in __nonzero__
raise TypeError("cannot determine truth value of Relational")
TypeError: cannot determine truth value of Relational
I suppose I expected it to return an unevaluated integral -
integral(sin(x**n),x)
David
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