>>>>> Jan Gorecki >>>>> on Thu, 19 Dec 2019 11:49:11 +0530 writes:
> Thank you Gabriel, > I agree that new behaviour makes much more sense. Just wanted to confirm > before resolving compatibility of my unit tests. > Best, > Jan Indeed, Gabe's explanation is right-on-spot: With the generalization of head() / tail(), we really found it undesirable to stay "internally inconsistent". We do have to grab the chance for not-quite-back-compatible improvements -- when the costs look comparably small -- for R 4.0.0. Martin > On Wed 18 Dec, 2019, 10:46 PM Gabriel Becker, <gabembec...@gmail.com> wrote: >> Jan, >> >> That is an intentional change as you can see in the documentation for >> head/tail in R-devel. Last time I discussed it with Martin, this behavior >> was desired and thus is unlikely to change unless "our" (ie his) mind does. >> >> The hope is that the new behavior is actually what people would want (note >> it already behaves this way for data.frames and for matrices, which are now >> explicitly array objects with 2 dimensions as well as classed as matrices, >> so its more consistent now, and more reasonable for the object). >> >> Best, >> ~G >> >> On Wed, Dec 18, 2019 at 2:44 AM Jan Gorecki <j.gore...@wit.edu.pl> wrote: >> >>> Hi R-devel community, >>> >>> I am aware of changes in R-devel in head/tail methods but I was not >>> expecting that to be a breaking change. >>> >>> # R 3.6.1 >>> ar = array(1:27, c(3,3,3)) >>> tail(ar, 1) >>> #[1] 27 >>> >>> The current output of R-devel is something that I would expect from a >>> >>> tail(ar, c(1, Inf, Inf)) >>> >>> or >>> >>> tail(ar, c(1, NA, NA)) >>> >>> calls. >>> Is it going to stay like this or there are plans to mitigate this >>> breaking change? >>> >>> # R-devel 2019-12-17 r77592 >>> ar = array(1:27, c(3,3,3)) >>> tail(ar, 1) >>> #, , 1 >>> # >>> # [,1] [,2] [,3] >>> #[3,] 3 6 9 >>> # >>> #, , 2 >>> # >>> # [,1] [,2] [,3] >>> #[3,] 12 15 18 >>> # >>> #, , 3 >>> # >>> # [,1] [,2] [,3] >>> #[3,] 21 24 27 >>> >>> Best, >>> Jan Gorecki >>> >>> ______________________________________________ >>> R-devel@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-devel >>> >> > [[alternative HTML version deleted]] > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel