Python solve equation for one variable

python solver sympy equations
hah picture hah · Dec 15, 2010 · Viewed 39.2k times · Source

I'm trying to solve an equation in python using SymPy. I have a generated equation (something like function = y(8.0-(y**3.0)) which I use with SymPy to create a new equation like this: eq = sympy.Eq(function, 2) which outputs y(8.0-(y**3.0)) == 2. but sympy.solve(eq) doesn't seem to work.

>>> from sympy import Eq, Symbol as sym, solve
>>> y = sym('y')
>>> eqa = Eq(y(8.0-(y**3.0)), 8)
>>> solve(eqa)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/pymodules/python2.6/sympy/solvers/solvers.py", line 332, in solve
    result = tsolve(f, *symbols)
  File "/usr/lib/pymodules/python2.6/sympy/solvers/solvers.py", line 716, in tsolve
    raise NotImplementedError("Unable to solve the equation.")
NotImplementedError: Unable to solve the equation.

thanks for reading.

Answer

user506710 picture user506710 · Dec 15, 2010

Yours is a non linear equation ... So you can use optimize.fsolve for it. For further details look for the function in this tutorial scipy

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