They differ in whether the row names are "automatic": > .row_names_info(a1) [1] -3 > .row_names_info(a2) [1] 3
Best, -Deepayan On Tue, 14 Nov 2023 at 08:23, Gabor Grothendieck <ggrothendi...@gmail.com> wrote: > > What is going on here? In the lines ending in #### the inputs and outputs > are identical yet one gives a warning and the other does not. > > a1 <- `rownames<-`(anscombe[1:3, ], NULL) > a2 <- anscombe[1:3, ] > > ix <- 5:8 > > # input arguments to #### are identical in both cases > > identical(stack(a1[ix]), stack(a2[ix])) > ## [1] TRUE > identical(a1[-ix], a2[-ix]) > ## [1] TRUE > > > res1 <- data.frame(stack(a1[ix]), a1[-ix]) #### > res2 <- data.frame(stack(a2[ix]), a2[-ix]) #### > ## Warning message: > ## In data.frame(stack(a2[ix]), a2[-ix]) : > ## row names were found from a short variable and have been discarded > > # results are identical > identical(res1, res2) > ## [1] TRUE > > > -- > Statistics & Software Consulting > GKX Group, GKX Associates Inc. > tel: 1-877-GKX-GROUP > email: ggrothendieck at gmail.com > > ______________________________________________ > 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
