similar to: The Wrong Choice: Locked in by license restrictions

Is there any R code available for solving ODE's? I am considering building an interface to ODEPACK, but don't want to duplicate any existing effort. -- Tom Wainwright NOAA/NMFS/NWFSC 2030 S Marine Science Dr Newport, OR 97365 USA thomas.wainwright at noaa.gov -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read

For those who don't wake up at 5.00 am and start reading /. http://searchnetworking.techtarget.com/originalContent/0,289142,sid7_gci935769,00.html -- Dave Cotton <dcotton@linuxautrement.com>

I am beginning a much-delayed update of odesolve to include several ordinary differential equation solvers from the Livermore package ODEPACK. These are much-used and reliable Fortran codes, and I plan (as I did for lsoda in the current odesolve package) to make as few changes as possible to the Fortran 77 code. However, recently someone wanted to make nested calls to lsoda, which will not work,

Dear NUT users and developers, Like the other years, before taking a small rest, here are some news related to NUT. * First, you should have seen the 2.0.5-pre1 release announcement. I don't think 2.0.5 is very far, but I realized that I've made an archive including the .svn directory (bad, bad me. I should know that release are made against exported svn, not checked out!) * Next,

Dear NUT users and developers, Like the other years, before taking a small rest, here are some news related to NUT. * First, you should have seen the 2.0.5-pre1 release announcement. I don't think 2.0.5 is very far, but I realized that I've made an archive including the .svn directory (bad, bad me. I should know that release are made against exported svn, not checked out!) * Next,

hope this help some one else --as it helped me, in undertanding contributions to * wiki pages... Regards! Samuel ----- Original Message ----- From: "whatis.com" <WhatIs-BAD63EB5A68046E1@lists.techtarget.com> To: "whatis.com" <WhatIs@lists.techtarget.com> Sent: Tuesday, January 06, 2004 10:31 AM Subject: Word-of-the-Day: wiki > THE

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

http://searchenterpriselinux.techtarget.com/news/article/0,289142,sid39_gci1328938,00.html -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!! -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 250 bytes Desc: OpenPGP digital signature URL:

Hi folks, I am planning to write some more time-consuming matrix manipulations in c++. What is the experience with the existing c++ matrix libraries? Do you have some recommendations? Are some libraries more compatible with R than the others? All suggestions welcome! Best, Ott

Security pundits have been warning about the dangers implicit with Web services for years. A good starting point for understanding the security issues related to Web services can be found at: http://searchwebservices.techtarget.com/originalContent/0,289142,sid26_gci872720,00.html Of course to really understand the security risks posed by Web services, you need to understand the basics of Web

Hi All, Microsoft just coming up with R2 (http://searchstorage.techtarget.com/originalContent/0,289142,sid5_gci11 50420,00.html?track=NL-52&ad=536546) I have couple of questions regarding it: 1. Have they modified/added new features to the core CIFS, RPC, etc. protocols to support some of those features, perhaps in the DFS or other areas? 2. In terms of CIFS, they claim outstanding

Hi everyone, i''m currently try migrate my mythtv-server into an xen maschine but the ivtv-driver for my Hauppauge PVR350 doesn''t work. Now, a lot of googling and reading later i''m now here. I''ve an error which i can''t exactly allocate: is it an driver or an xen generated error ? I got with the ivtv-drivers following error: (0.2.x ivtv driver)

I'm solving the differential equation dy/dx = xy-1 with y(0) = sqrt(pi/2). This can be used in computing the tail of the normal distribution. (The actual solution is y(x) = exp(x^2/2) * Integral_x_inf {exp(-t^2/2) dt} = Integral_0_inf {exp (-xt - t^2/2) dt}. For large x, y ~ 1/x, starting around x~2.) I'm testing both lsoda and rk4 from the package odesolve. rk4 is accurate using step

Dear Colleagues, Our group is also working on implementing the use of R for pharmacokinetic compartmental analysis. Perhaps I have missed something, but > fit <- nls(noisy ~ lsoda(xstart, time, one.compartment.model, c(K1=0.5, k2=0.5)), + data=C1.lsoda, + start=list(K1=0.3, k2=0.7), + trace=T + ) Error in eval(as.name(varName), data) : Object

Hi - I am getting different results when I run the numerical integrator function lsoda (odesolve package) on a Mac and a PC. I am trying to simulating a system of 10 ODE's with two exogenous pulsed inputs to the system, and have had reasonably good success with many model parameter sets. Under some parameter sets, however, the simulations fail on the Mac (see error message below). The

R help list subscribers, I am a new user of R. I am attempting to use R to explore a set of equations specifying the dynamics of a three trophic level food chain. I have put together this code for the function that is to be evaluted by LSODA. My equations Rprime, Cprime, and Pprime are meant to describe the actual equation of the derivative. When I run LSODA, I do not get the output that

I'm running an LSODA to generate some graphs, but I need to stop at a certain point and use those values to generate another LSODA output. This is working fine, but when I try to run the second LSODA, I get the "Error in eval(expr, envir, enclos) : object 'N' not found". Any ideas what can be causing this? I have no object 'N' anywhere in the script. I made an

Dear R users: I have a problem about catch the value from function. I have following two functions (part): sbolus1 <- function() { ....... for( i in 1:Subject) { kel<-par1 Vd<-par2 PKindex<-sbolus1.out(PKtime,kel,Vd,defun,par1,par2,Dose,i) } savefile(PKindex) } sbolus1.out<-function(PKtime,kel,Vd,defun,par1,par2,Dose,i) { time<-PKtime$time

I'm trying to use odesolve for integrating various series of coupled 1st order differential equations (derived from a system of enzymatic catalysis and copied below, apologies for the excessively long set of parameters). The thing that confuses me is that, whilst I can run the function rk4: out <- rk4(y=y,times=times,func=func, parms=parms) and the results look not unreasonable:

Dear list - Does anyone have any ideas / comments about why I am receiving the following warning when I run lsoda: 1: lsoda-- at t (=r1), too much accuracy requested in: lsoda(start, times, model, parms) 2: for precision of machine.. see tolsf (=r2) in: lsoda(start, times, model, parms) I have tried changing both rtol and atol but without success. I saw the thread in the