[R] differential equations

[Setzer.Woodrow@epamail.epa.gov]

I have a library that implements LSODA, from the netlib collection.  It allows
the ODE system to be written as an R function, and allows the parameters of the
system to be passed as a vector to the function.   I have tested it in Linux and
Windows, and seems to work OK.  This is still in the 'alpha' stage of
development, but I would be happy to share what I have.

LSODA is an algorithm that automatically switches between 'stiff' and
'non-stiff' solvers: see the documentation in the fortran code.

Let me know if you want the package (called 'odesolve'), and whether you want
source or a precompiled package for Windows (that will take longer).

R. Woodrow Setzer, Jr.                                                    Phone:
(919) 541-0128
Biostatistics and
Fax:  (919) 541-4002
Research Support Staff
NHEERL MD-55; US EPA; RTP, NC 27711


|--------+----------------------------->
|        |          Heberto at meakins.lan|
|        |          .mcgill.ca         |
|        |                             |
|        |          07/26/2000 11:00 AM|
|        |                             |
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  |       To:     r-help at stat.math.ethz.ch                                     |
  |       cc:                                                                  |
  |       Subject:     [R] differential equations                              |
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Hi, Does somebody knows of the existence of a library of functions
for solving differential equations, I need a solver for a system of non
linear first order differential equations. I think there was something
in IMSL but that was a long time ago and probably there are some
new algorithms in the new now.
Thanks for any pointers.
.

R. Heberto Ghezzo  Ph.D.
Meakins-Christie Labs
McGill University
Montreal - Canada
heberto at meakins.lan.mcgill.ca
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