What version of SymPy are you using? For me in 1.4, solve(omega_nf -
942.5, J_u, dict=True) returns [{J_u: 0.00235331614197392}]In general, solve() only returns closed-form solutions, so if it doesn't return a solution, it may just mean that it couldn't find one in closed-form. If you know that you want a numeric solution, you may be better off starting with nsolve. I believe nsolve() gives the wrong answer because you passed verify=False. Without it, it gives an error that it couldn't find the root. The default Newton's method solver has a hard time with this equation, but you can use a different one. For instance, nsolve(omega_nf - 942.5, [0, 1], solver='bisect') immediately returns the solution 0.00235331614197389. See the docstring of nsolve. Aaron Meurer On Wed, Jun 5, 2019 at 7:20 AM pull_over93 <[email protected]> wrote: > > Probably I'm not using sympy correctly, here I have this equation : > > omega_nf = sqrt(2)*sqrt(87791997.5351708 - > 12563210.5479217*sqrt(-0.00144380926150678*J_u + 48.4180817181289*(J_u + > 0.00027375075)**2 - 3.58991000729848e-7)/(J_u + 0.00027375075) + > 2392.05862861605/(J_u + 0.00027375075))/2 > and I want to solve this equation : > 942.5 = omega_nf > > I have tried the classic sympy.solve() > > eq_solution = sym.solve(omega_nf - 942.5 , J_u, dict = True) > > > But I do not have any output. > Than I've tried using sympy.nsolve() > eq_solution = sym.nsolve(omega_nf - 942.5, J_u, 0.0023, verify=False) > > But I don't get the right answer. (Right answer: J_u = 0.0023) > There's a smarter way to use sympy ? > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/548b341e-932e-4d6a-a32b-166e29f822c2%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6J2w1vWGC-mu_qzBUE6wdt1Pg5T3vwkBc6E1VaOnQdHmQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
