[R] Newton method again
Ravi Varadhan
rvaradhan at jhmi.edu
Wed Apr 8 04:41:27 CEST 2009
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: rvaradhan at jhmi.edu
----- Original Message -----
From: Roslina Zakaria <zroslina at yahoo.com>
Date: Tuesday, April 7, 2009 10:35 pm
Subject: [R] Newton method again
To: Rolf Turner <r.turner at auckland.ac.nz>, R help forum <R-help at 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.
>
>
>
>
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