From: Charilaos Skiadas <cskiadas_at_gmail.com>

Date: Mon, 17 Dec 2007 01:39:24 -0500

}

nlm(f, c(2,2))

R-help_at_r-project.org mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon 17 Dec 2007 - 06:44:34 GMT

Date: Mon, 17 Dec 2007 01:39:24 -0500

Turn your problem into an optimization one and use the various optimization abilities of R, for instance have a look at nlm:

?nlm

As an example to solve the rather simple:
x-y=0

x+y=2

We could do:

f <- function(vals) {

x <- vals[1] y <- vals[2] sum(c(x-y,x+y-2)^2)

}

nlm(f, c(2,2))

PS: A google search for "rhelp solving nonlinear system of equations" would likely have given you some starting points. PS2: Perhaps someone more expert could comment on the differences between optim, nlm and nlminb.

Haris Skiadas

Department of Mathematics and Computer Science
Hanover College

On Dec 17, 2007, at 12:43 AM, Xin wrote:

> Dear:

*>
**>
**>
**> I have a paired equation below. Can I solve (x,y) using R.
**>
**>
**>
**> Thanks!
**>
**>
**>
**> Xin
**>
**>
**>
**> A=327.727
**>
**> B=9517.336
**>
**> p=0.114^10
**>
**>
**>
**> (1-p)*y*(1-x)/x/(1-x^y)=A
**>
**> A(1+(1-x)*(1+y)/x-A))=B
*

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