Juan, > > I already know that. > Okay, great.
> I usually struggle when using data.table inside my own packages. I start > by listing it in imports only (and not importing anything) > "imports only (and not importing anything)"? - what do you mean? > but end up depending on it, as for the users to be able to manipulate the > data.tables with [ and :=. > It depends on whether you want the data.table NAMESPACE to be attached or not. I think these posts may help: http://r.789695.n4.nabble.com/Re-R-CMD-check-checking-in-development-version-of-R-td4696125.html#none http://stackoverflow.com/questions/8637993/better-explanation-of-when-to-use-imports-depends > I end up importing some or all of data.table also, because I don't know > how to call := the :: notation. > I don't really follow this. Why do you want to use `::` along with `:=`. The last post we just discussed that it can't be done, as it is not designed to be used outside of `[...]` and in very specific ways. Check data.table:::`:=`. It is designed to error. This post might help: http://stackoverflow.com/q/7033106/559784 > My specific problem was on using := during on.Load. > It'd be useful to know what you are trying to do, along with your code. > I already know how to use it, and know that it can only be used inside [. > Maybe it is imperative to @import data.table to be able to use :=? > I don't follow exactly how you are trying to use := to answer this. Arun > > On Mon, Jan 19, 2015, 19:35 Arunkumar Srinivasan <[email protected]> > wrote: > >> Within the square brackets in "DT[ .... ]" and even there, only in `j` >> (as the error message points out). >> >> On Mon, Jan 19, 2015 at 11:31 PM, Juan Manuel Truppia < >> [email protected]> wrote: >> >>> Arun, what does "within the frame of data.table" mean? >>> >>> On Mon, Jan 19, 2015, 19:17 Arunkumar Srinivasan <[email protected]> >>> wrote: >>> >>>> Juan, >>>> >>>> `:=` is designed to be used only within the frame of data.table. >>>> >>>> On Mon, Jan 19, 2015 at 10:45 PM, Juan Manuel Truppia < >>>> [email protected]> wrote: >>>> >>>>> Hi, I'm using data.table inside my own packages. I'm having some >>>>> trouble using data.table functions on my .onLoad method. >>>>> I'm actually depending (not importing) data.table, but even then, I >>>>> can't get := to work in .onLoad. >>>>> I'm using the `:=`(a = x, b = y) version, and getting >>>>> >>>>> Error in `:=`(a = x) : >>>>> Check that is.data.table(DT) == TRUE. Otherwise, := and `:=`(...) are >>>>> defined for use in j, once only and in particular ways. See help(":="). >>>>> >>>>> If I comment that, and then run it from the console after the package >>>>> is loaded, it works. >>>>> >>>>> Any ideas? >>>>> >>>>> _______________________________________________ >>>>> datatable-help mailing list >>>>> [email protected] >>>>> >>>>> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help >>>>> >>>> >>>> >>
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