yhsu6 at illinois.edu
2009-Jul-17 05:18 UTC
[R] Solving two nonlinear equations and two knowns
Dear R users, I have two nonlinear equations, f1(x1,x2)=0 and f2(x1,x2)=0. I try to use optim command by minimize f1^2+f2^2 to find x1 and x2. I found the optimal solution changes when I change initial values. How to solve this? BTW, I also try to use grid searching. But I have no information on ranges of x1 and x2, respectively. Any suggestion to solve this question? Thanks, Kate
yhsu6 wrote:> > I have two nonlinear equations, f1(x1,x2)=0 and f2(x1,x2)=0. I try to use > optim command by minimize f1^2+f2^2 to find x1 and x2. I found the optimal > solution changes when I change initial values. How to solve this? > > BTW, I also try to use grid searching. But I have no information on ranges > of x1 and x2, respectively. > >See: http://markmail.org/message/w7bymjr6awihos73 But if you have no idea of the ranges of x1 and x2, it will be difficult. Dieter -- View this message in context: http://www.nabble.com/Solving-two-nonlinear-equations-and-two-knowns-tp24530580p24537929.html Sent from the R help mailing list archive at Nabble.com.