Thank you. How nice an simple. Sounds like a strategy that could be baked into solve().
Jason moorepants.info +01 530-601-9791 On Tue, Jul 26, 2016 at 2:48 PM, Denis Akhiyarov <denis.akhiya...@gmail.com> wrote: > if you define k_delta*k_phi as another terms, e.g. c4, > then k_phi disappears and the equations are linear. > > > On Tuesday, July 26, 2016 at 11:12:50 AM UTC-5, Jason Moore wrote: >> >> I have been working on a problem and end up needing to solve a system of >> nonlinear equations that are polynomials wrt to the variables of interest. >> There are six equations and six unknowns and only two of the variables are >> related non-linearly. This is the basic form: >> >> [-c3 + 55.3719398861938], >> [-c2 - 3*c3 + 1524.09472216942], >> [-c1 - 3*c2 - 100*c3 - 111.682822870417*k_delta*k_phi + 16670.819288228] >> [-c0 - 3*c1 - 100*c2 - 8153.56338281556*k_delta*k_phi + >> 3891.45616272381*k_delta + 55610.0242428841] >> [-3*c0 - 100*c1 - 90978.6714602982*k_delta*k_phi + 276475.776481344] >> [-100*c0 - 38237.9055133813*k_delta + 84011.44228978] >> >> But more generally, I have symbolic coefficients. SymPy solve solves this >> correctly! Which is cool, but it took 4 hours to solve on my machine. I >> haven't tried to solve the above numerical form yet. >> >> I'm curious if there is something I should be doing with SymPy to help it >> solve this faster. If I change some of the symbols to specific rationals >> I've had it solve as quickly as 20 minutes. >> >> The full example is here: >> http://nbviewer.jupyter.org/gist/moorepants/0e85508f1b0753b01e4d9ced83e3519c/solve_inner_loop_gains.ipynb >> >> Jason >> moorepants.info >> +01 530-601-9791 >> > -- > 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 sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > 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/0cae5521-2adf-43ab-ba18-424e1d76a2b4%40googlegroups.com > <https://groups.google.com/d/msgid/sympy/0cae5521-2adf-43ab-ba18-424e1d76a2b4%40googlegroups.com?utm_medium=email&utm_source=footer> > . > 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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. 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/CAP7f1Ah3X3ibJuk4Rk_xPOsJEprsLQrcFULsNn1FfA1Gtty%3DVw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
