From the NEWS file: CHANGES IN R VERSION 2.6.0 SIGNIFICANT USER-VISIBLE CHANGES o integrate(), nlm(), nlminb(), optim(), optimize() and uniroot() now have '...' much earlier in their argument list. This reduces the chances of unintentional partial matching but means that the later arguments must be named in full.
--- Vincent Goulet, Associate Professor École d'actuariat Université Laval, Québec [EMAIL PROTECTED] http://vgoulet.act.ulaval.ca Le jeu. 13 mars à 12:05, Ravi Varadhan a écrit : > Hi, > > > > I have noticed that there is a change in the use of ellipses or . in R > versions 2.6.1 and later. In versions 2.5.1 and earlier, the . were > always > at the end of the argument list, but in 2.6.1 they are placed after > the main > arguments and before method control arguments. This results in the > user > having to specify the exact (complete) names of the control > arguments, i.e. > partial matching is not allowed. > > An example with integrate() : > >> integrate(function(x) exp(-x^2), lower=-Inf, upper=L, subdiv=1000) > > Error in f(x, ...) : unused argument(s) (subdiv = 1000) > >> integrate(function(x) exp(-x^2), lower=-Inf, upper=L, >> subdivisions=1000) > > 1.633051 with absolute error < 1.6e-06 > > Here is an example with optim(): > >> res <- optim(50, fw, meth="BFGS", control=list(maxit=20000, temp=20, > parscale=20)) > > Error in fn(par, ...) : unused argument(s) (meth = "BFGS") > > FYI, I am using R version 2.6.1 on Windows XP. > > May I ask what the rationale behind this change is and also about > the pros > and cons of the two different ways of specifying (.)? > > Thank you very much. > > Best, > > Ravi. > > ------------------------------------------------------------ > Ravi Varadhan, Ph.D. > Assistant Professor, The Center on Aging and Health > Division of Geriatric Medicine and Gerontology > Johns Hopkins University > Ph: (410) 502-2619 > Fax: (410) 614-9625 > Email: [EMAIL PROTECTED] > Webpage: http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html > ---------------------------------------------------------------------------- ______________________________________________ R-help@r-project.org 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.
