We should have, for example, `if (b < 0) == True or ...` here
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):
Kalevi Suominen
On Tuesday, August 20, 2019 at 11:08:59 PM UTC+3, David Bailey wrote:
>
> 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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