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
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