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Student Support Forum: 'COMPLICATED non-linear system of equations- sol...' topicStudent Support Forum > General > "COMPLICATED non-linear system of equations- sol..."

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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






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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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