Obviously you looked at the code. Thank you! So you didn't see any obvious
type screwups, either? Do you have other tips or remarks?
[email protected] schrieb am Samstag, 30. Oktober 2021 um 14:23:41 UTC+2:
> I do not know solve well but I suspect that it cannot handle vector
> equations. There should probably be separate equations for the components.
>
> Kalevi Suominen
> On Saturday, October 30, 2021 at 9:28:06 AM UTC+3 Andreas Schuldei wrote:
>
>> I have a system of longish equations and when calling .solve() on it, I
>> get this traceback:
>>
>> Traceback (most recent call last):
>> File "C:/Users/Andreas
>> Schuldei/PycharmProjects/lissajous-achse/hgü-kabel-detektion-symbolic.py",
>> line 109, in <module>
>> result = solve(equations, (CM0, theta_i, theta_j, theta_k, i, a,
>> B_earth))
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\solvers\solvers.py",
>>
>> line 1096, in solve
>> solution = _solve_system(f, symbols, **flags)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\solvers\solvers.py",
>>
>> line 1730, in _solve_system
>> i, d = _invert(g, *symbols)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\solvers\solvers.py",
>>
>> line 3118, in _invert
>> rhs -= indep
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\core\numbers.py",
>>
>> line 2194, in __sub__
>> return Rational.__sub__(self, other)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\core\decorators.py",
>>
>> line 89, in __sympifyit_wrapper
>> return func(a, b)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\core\numbers.py",
>>
>> line 1725, in __sub__
>> return Number.__sub__(self, other)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\core\decorators.py",
>>
>> line 89, in __sympifyit_wrapper
>> return func(a, b)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\core\numbers.py",
>>
>> line 733, in __sub__
>> return AtomicExpr.__sub__(self, other)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\core\decorators.py",
>>
>> line 251, in _func
>> return func(self, other)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\core\decorators.py",
>>
>> line 126, in binary_op_wrapper
>> return f(self)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\core\decorators.py",
>>
>> line 127, in binary_op_wrapper
>> return func(self, other)
>> File "C:\Users\Andreas
>> Schuldei\PycharmProjects\lissajous-achse\venv\lib\site-packages\sympy\vector\basisdependent.py",
>>
>> line 352, in __rsub__
>> raise TypeError("Invalid argument types for subtraction")
>> TypeError: Invalid argument types for subtraction
>>
>> Process finished with exit code 1
>>
>> I stared at my code long and hard, and fixed all instances of wrong types
>> that i could think of. Also, in order to catch the error earlier, I tried
>> insterting .simplify() calls in places that might benefit from them - but
>> the process ran for hours, doing the simplyfy() without even reaching the
>> solve() call.
>>
>> So I am asking for tricks to investigate the types and them fitting
>> together, earlier. You can find my code attached. (please critique it, I
>> want to learn!).
>>
>>
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