I'm using this code:
from sympy.solvers import solve
from sympy import Symbol
x = Symbol('x')
function = input("Insert function: ")
def gx(function,x):
return solve(function,x,dict=True)
print(gx(function,x))
When I write cos(x)+x I get this error msg:
Traceback (most recent call last):
File "/home/raulpenate/Documents/pyhton/MetodosNumericos/Tareas/testing.py", line 11, in <module>
print(gx(function,x))
File "/home/raulpenate/Documents/pyhton/MetodosNumericos/Tareas/testing.py", line 9, in gx
return solve(function,x)
File "/home/raulpenate/.local/lib/python3.9/site-packages/sympy/solvers/solvers.py", line 1095, in solve
solution = _solve(f[0], *symbols, **flags)
File "/home/raulpenate/.local/lib/python3.9/site-packages/sympy/solvers/solvers.py", line 1714, in _solve
raise NotImplementedError('\n'.join([msg, not_impl_msg % f]))
NotImplementedError: multiple generators [x, cos(x)]
No algorithms are implemented to solve equation x + cos(x)
And I want to get that value from the
NotImplementedError: multiple generators [x, cos(x)]
Especifically that cos(x), how can I get that value from there?. I can't find that part in the documentation.
NotImplementedError will occur if sympy can't find an analytic solution. You can solve this numerically instead:
from sympy import nsolve, cos, Symbol
x = Symbol("x")
nsolve(cos(x) + x, 0) # -0.739085133215161
This problem won't is unlikely to have a closed form in terms of elementary functions, see https://math.stackexchange.com/questions/46934/what-is-the-solution-of-cosx-x/1174794#1174794 and https://mathworld.wolfram.com/DottieNumber.html