I believe these questions belong on r-package-devel, not here. Bert Gunter
"The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Fri, Mar 5, 2021 at 5:25 AM Martin Møller Skarbiniks Pedersen < [email protected]> wrote: > Hi, > > I am converting a couple of functions into a R-package. Many of the > functions use data.table. > I have two questions using data.table in my own package. > Normally I would put each question in separate emails but I think they > might be connected. > > First question is short and I think the answer is yes. > 1. Do I always need to prefix data.table each time I use something from > that package? > Eg. DT <- data.table::data.table(x=rep(c("b","a","c"),each=3), y=c(1,3,6), > v=1:9) > > Second question is longer. > 2. In this small example code: > hello <- function() { > DT <- data.table::data.table(x=rep(c("b","a","c"),each=3), y=c(1,3,6), > v=1:9) > DT[, .(sum(v))] > } > > I get these warnings from R CMD check: > hello: no visible global function definition for ‘.’ > hello: no visible binding for global variable ‘v’ > Undefined global functions or variables: > . v > > According to: vignette("datatable-importing", package = "data.table") > The solution is > hello <- function() { > v <- NULL > . <- NULL > > And it works but looks a bit weird. > Is there a better solution? > > Regards > Martin > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list -- To UNSUBSCRIBE and more, see > 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. > [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list -- To UNSUBSCRIBE and more, see 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.
