[Rd] data.frame weirdness

[Gabor Grothendieck]

In that case identical should be FALSE but  it is TRUE

identical(a1, a2)
## [1] TRUE


On Tue, Nov 14, 2023 at 8:58 AM Deepayan Sarkar
<deepayan.sarkar using gmail.com> wrote:
>
> 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
> <ggrothendieck using 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 using r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel



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