>From the help page: control: a list of control values ...
Now, control=c(minFactor=1/2048) is not a list but a numeric vector. So it is warning you about incorrect usage. On Thu, 26 Apr 2007, Pedro Mardones wrote: > Dear R users; > I was trying to fit a nonlinear model using gnls (nlme version 3.1-80, > R 2.5.0, WinXP) and I got the following error and warning message: > > Error in gnls(ht ~ a1 * hd * (1 - a2 * exp(-a3 * (dbh/dq2))), data = hdat, : > Step halving factor reduced below minimum in NLS step > In addition: Warning message: > $ operator is deprecated for atomic vectors, returning NULL in: > control$nlmStepMax > > What is new for me is the warning message. It appears when I try to > specify different settings using the control statement.For example: > >> hm02<-gnls(ht~a1*hd*(1-a2*exp(-a3*(dbh/dq2))),data=hdat, > + start=c(a1=1.04,a2=1.38,a3=2.88),weights=varExp(), > + control=c(minFactor=1/2048)) > > Any comment will be appreciate > > Thanks > PM > > ______________________________________________ > R-help@stat.math.ethz.ch 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. > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch 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.
