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 Author Comment/Response Kaitlin 12/06/12 4:21pm Hello, I have an extremely complicated non-linear system of equations that I would like to solve using some kind of numerical method. I basically have three equations and three unknowns, k2, k3 and c3 that look something like this (greatly simplified for illustration): -2.25*10^8+c3*k2-0.6k2^2-6.077*10^7*c3*k3-105823*k2*Sqrt[2.30*10^8-c3^2/12048.7525*k2^2]+etc, on the order of 20-40 terms =0 I have tried and failed miserably at solving for any term to substitute it into the other two equations. I think I need to use FindRoot[{eqn1==0,eqn2==0,eqn3==0},{{k2,k2guess},{k3,k3guess},{c3,c3guess}}] but a) Do I just put in the equations, or do I also need the ==0 part? b) Do my equations need to be functions for this to work? c) Is there a way to make these equations into functions and try and get a better idea of their behavior so I have a chance of making a guess? If anyone has ideas or a sample code for solving non-linear systems of equations they could point me to, I would appreciate it! Thanks, Kaitlin URL: ,

 Subject (listing for 'COMPLICATED non-linear system of equations- sol...') Author Date Posted COMPLICATED non-linear system of equations- sol... Kaitlin 12/06/12 4:21pm Re: COMPLICATED non-linear system of equations-... Jarrod Schif... 12/07/12 04:31am Re: COMPLICATED non-linear system of equations-... Bill Simpson 12/09/12 00:20am Re: Re: COMPLICATED non-linear system of equati... Kaitlin 12/09/12 9:01pm Re: COMPLICATED non-linear system of equations-... Kaitlin 12/10/12 10:23am Re: Re: COMPLICATED non-linear system of equati... Bill Simpson 12/10/12 8:39pm NMinimize NAN Kaitlin 12/11/12 3:51pm
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