[R] nonlinear curve fitting on a torus

Spencer Graves spencer.graves at pdf.com
Sun Apr 13 22:54:17 CEST 2008

      Having seen no reply to this, I will offer a couple of comments 
that may or may not be useful.  Googling for "geodesic equation on a 
torus" produced interesting hits, but RSiteSearch("geodesic equation on 
a torus") found nothing.  RSiteSearch("torus") returned 33 hits, some of 
which referred to a package "geozoo". 

      If you want a solution of a differential equation, you might 
consider lsoda {odesolve}.  The 'fda' package may also be useful. 

      To say more, I'd prefer to hear more specifics from you.  PLEASE 
do read the posting guide "http://www.R-project.org/posting-guide.html" 
and provide commented, minimal, self-contained, reproducible code.  
Doing so can make it much easier for people to understand what you 
want.  If you provide code that doesn't quite work, someone who is 
interested can copy it from your email into R and try things, possibly 
generating a solution to your problem.  Without a self-contained 
example, you restrict the pool of possible respondents to people who 
have actually worked with a "geodesic equation on a torus" -- or to 
fools like me who are willing to expose their ignorance commenting on 
something we know essentially nothing about. 

      Hope this helps. 
      Spencer Graves

Sungsu wrote:
>   Dear R users.
>   I have data observed on the surface of a torus, and
>   am trying to fit the nonlinear regression using
>   the geodesic equation on a torus. Could anyone give
>   me a helpful advise on this problem? I would
>   definitely appreicate your reply.
> Sincerely,    
>              SUNGSU KIM
> 	[[alternative HTML version deleted]]
> ______________________________________________
> R-help at r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

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