[datatable-help] rbind behavior

[Matthew Dowle]

Good. FR#1634 added.
Matthew

On Sun, 2011-10-23 at 20:28 -0400, Steve Lianoglou wrote:
> I think I'm a +1 on doing the xref (like data.frame does), but
> emitting a warning when it is done .. unlike data.frame.rbind, which
> just does it silently ...
> 
> -steve
> 
> 
> On Sun, Oct 23, 2011 at 8:08 PM, Matthew Dowle <mdowle at mdowle.plus.com> wrote:
> > Ah. Then I think that was deliberate at the time. I sometimes mislabel
> > column names and want R to warn me rather than doing silent cross-ref.
> > Other times I just think in terms of column order and am not too
> > concerned with the names. I don't mind changing it to do cross ref for
> > consistency but would like to keep the warning. Views?
> >
> > On Sun, 2011-10-23 at 14:35 -0400, Steve Lianoglou wrote:
> >> I think he means that running data.frame.rbind on these:
> >>
> >> R> d1 <- data.frame(a=1:10, b=11:20)
> >> R> d2 <- data.frame(b=101:120, a=21:30)
> >> R> rbind(d1, d2)
> >>
> >> Will "cross ref" the "a" and "b" columns and stack them correctly on
> >> top of each other.
> >>
> >> Doing the same with two data.table will bind the two together, but
> >> won't do the cross-ref. It just gives you a warning that the names
> >> didn't match, but rbind's the first to the first, and the second to
> >> the second (columns) anyway.
> >>
> >> -steve
> >>
> >> On Sun, Oct 23, 2011 at 2:19 PM, Matthew Dowle <mdowle at mdowle.plus.com> wrote:
> >> > Hi. Not sure what you mean, example needed please. Is that with v1.7.1 now
> >> > on CRAN? There has been some to and fro on chind/rbind in last few
> >> > versions.
> >> >
> >> >> Hi Matthew,
> >> >>
> >> >> Not sure if this is planned or inadvertent, but rbind matches up named
> >> >> columns with data.frames but doesn't with data.table (data.table does give
> >> >> the friendly warning).
> >> >>
> >> >> Thanks as always for your excellent package,
> >> >>
> >> >> Damian
> >> >>
> >> >>
> >> >> _______________________________________________
> >> >> datatable-help mailing list
> >> >> datatable-help at lists.r-forge.r-project.org
> >> >> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
> >> >
> >> >
> >> > _______________________________________________
> >> > datatable-help mailing list
> >> > datatable-help at lists.r-forge.r-project.org
> >> > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
> >> >
> >>
> >>
> >>
> >
> >
> >
> 
> 
>