Hi, I do not know what your problem is, but it seems like you want to solve a system of non-linear equations.
Look at the function dfsane() in the package "BB". It doesn't require you to specify jacobians. require(BB) ?dfsane Ravi. ____________________________________________________________________ Ravi Varadhan, Ph.D. Assistant Professor, Division of Geriatric Medicine and Gerontology School of Medicine Johns Hopkins University Ph. (410) 502-2619 email: rvarad...@jhmi.edu ----- Original Message ----- From: Roslina Zakaria <zrosl...@yahoo.com> Date: Tuesday, April 7, 2009 10:35 pm Subject: [R] Newton method again To: Rolf Turner <r.tur...@auckland.ac.nz>, R help forum <R-help@r-project.org> > Hi Rolf, > > I would like to extend the problem that I asked you before regarding > the newton method using 4 functions with 4 parameters. My functions > involve the modified bessel function of the first kind which I can > type them without any problem. > The big problem is the Jacobian matrix. > I use Maple 11.0 to get the algebraic expression for the Jacobian > matrix. The problem is that the Jacobian matrix is so complicated and > it is quite impossible to type the expression as I end up of more than > 50 pages for the algebraic form of the Jacobian. Can you suggest any > method to solve the problems? > > Thank you so much for your attention and help. > > > > Roslina. > > > > > ______________________________________________ > R-help@r-project.org mailing list > > PLEASE do read the posting guide > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@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.
