Robin Hankin wrote: > Peter > > Aha! so R backticks work just like bash backticks (duh!) >
Er, no. Backticks in shells have a command inside that will be evaluated and replaced by its output. (This is a bit confusing, but single and double quotes were already taken at the time...) > unless they are on the LHS of an assignment. > > [We bash people now use $(...) instead] > > Could we add something to this effect to Quotes.Rd? > > > rksh > > > On 4 Dec 2006, at 14:33, Peter Dalgaard wrote: > > >> Robin Hankin wrote: >> > [snip] > >>> What exactly do backticks do that single or double quotes don't? >>> >>> >> I don't know whether we really want to be that dogmatic about it, >> but in >> a nutshell >> >> `like this` <- 2 >> "like that" <- 3 >> print(`like this`) >> print("like that") >> >> I.e. backtick'ed names work whereever ordinary names do, but quoted >> names work only on the LHS of assignments. >> >> The note in ?formula should probably be understood defensively: We >> intend backtick'ed names to work in all contexts, but there may be >> programming practices where the backticks are not preserved >> (notably if >> there is a deparse-reparse step involved). >> >> >>> Where do I look for documentation on this? >>> >>> >>> >>> >>> -- >>> Robin Hankin >>> Uncertainty Analyst >>> National Oceanography Centre, Southampton >>> European Way, Southampton SO14 3ZH, UK >>> tel 023-8059-7743 >>> >>> ______________________________________________ >>> 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. >>> >>> >> -- >> O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B >> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K >> (*) \(*) -- University of Copenhagen Denmark Ph: (+45) >> 35327918 >> ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) >> 35327907 >> > > -- > Robin Hankin > Uncertainty Analyst > National Oceanography Centre, Southampton > European Way, Southampton SO14 3ZH, UK > tel 023-8059-7743 > > ______________________________________________ > 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. > -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ 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.