[R] setRefClass in package

[Bert Gunter]

I think this query fits better on r-package-devel rather than 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 Wed, Mar 24, 2021 at 6:07 AM Jeremie Juste <jeremiejuste using gmail.com>
wrote:

> Hello,
>
> I was wondering how to call a function outside a setRefClass but inside
> the package without export it. Let me explain by means of an example.
>
> - in the file test-package/R/test.R
>
> ##' some description
> ##'
> ##' some details
> ##' @title test
> ##' @return sideeffect
> ##' @author Jeremie Juste
> ##' @export test
> ##' @import data.table
> test <- setRefClass("test",
>             list(dt="data.table"))
>
>
> test$methods(
>
>   initialize = function(x){
>     dt <<- remove_if_all_na(x[,abc:=1])
>     }
> )
>
>
> ##' remove rows for which all values are NA
> ##'
> ##' @title remove_if_all_NA
> ##' @param dt
> ##' @return dt
> ##' @author Jeremie Juste
> remove_if_all_NA <- function(dt) {
>   cn <- colnames(dt)
>   dt[!dt[NA],on=cn]
> }
>
>
> Here when I build and install the package test-package, if I don't export
> remove_if_all_NA
>
> ##' remove rows for which all values are NA
> ##'
> ##' @title remove_if_all_NA
> ##' @param dt
> ##' @return dt
> ##' @author Jeremie Juste
> ##' @export
> remove_if_all_NA <- function(dt) {
>   cn <- colnames(dt)
>   dt[!dt[NA],on=cn]
> }
>
> The package cannot use it.
>
> library(test-package)
> library(data.table)
>
> > aa <- data.table(a=1:10,b=letters[1:10])
> > b <- test(aa)
> Error in remove_if_all_na(x[, `:=`(abc, 1)]) :
>   could not find function "remove_if_all_na"
>
> Do you have any recommendations? The official documentation for
> setRefClass is a bit thin for me but I wanted to use a tools that is going
> to stay. Any tip is
> welcome.
>
> Best regards,
> Jeremie
>
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