On Thu, Oct 4, 2012 at 6:31 PM, Peter Meilstrup <peter.meilst...@gmail.com> wrote: > On Thu, Oct 4, 2012 at 6:12 PM, Bert Gunter <gunter.ber...@gene.com> wrote: >> The R Language definition manual explains all of this. Read it. > > I always reread that before I post to this list. > > The only relevant mention of "missing" in the R Language Definition > that I could find were in section 4.1.2 on page 25, and that section
Page 15, "NA handling" seems "relevant, " as does ?NA (at the command prompt in R). See also 2.5 in the Introduction to R tutorial. > did not answer anything about "missing" as a special symbol (e.g. that > my be put in a formal argument list.) > > There is another mention of `...` in section 4.3.2 and it does not See section 2.1.9 of the Language Definition manual and 10.4 of Intro to R. > explain some things, such as under what circumstances one would get a > "`...` used in incorrect context" error. How could it possibly know that? -- Bert > > Peter > >>> >>> Thanks. >>> >>> Just so I have my mental model correct, I'm gathering that missing/`` >>> is a symbol that the interpreter has a special rule for -- evaluating >>> it raises an error, as opposed to objects that evaluate to themselves >>> or variable names that evaluate to objects. >>> >>> Does the same sort of thing explain the behavior of `...`? When the >>> interpreter comes across `...` in the arguments during evaluation of a >>> call, it trips a special argument-interpolating behavior? >>> >>> Peter >>> >>> ______________________________________________ >>> R-devel@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-devel >> >> >> >> -- >> >> Bert Gunter >> Genentech Nonclinical Biostatistics >> >> Internal Contact Info: >> Phone: 467-7374 >> Website: >> http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel