[datatable-help] Random setnames() error although I don't even call this function.

[Christoph Jäckel]

That was the answer, thanks a lot!

On Wed, Sep 12, 2012 at 1:12 AM, Matthew Dowle <mdowle at mdowle.plus.com>wrote:

>
> This sounds like :
>
> o   Chris Neff for #2146: using := to add a column to the result of a
>     simple column subset such as DT[,list(x)], or after changing all
>     column names with setnames(), was an error. Fixed and tests added.
>
> which was fixed just before 1.8.2 went to CRAN.
>
> Please run test.data.table() on the Windows machine to ensure it returns
> 717 tests passed precisely. If not, then you managed to install a slightly
> older version of 1.8.2 from R-Forge in the one or two day window that was
> possible, after it was named 1.8.2 but before that fix was made. If so,
> reinstalling from CRAN should fix it.
>
>
> > Hi together,
> >
> > here's my code:
> >
> > library(data.table)
> > test_fun <- function(DT, year) {
> >
> >   adj_r2   <- DT[, list(Tau_1 = summary(lm(NI_1 ~
> > Total_Assets))$adj.r.squared,
> >                         Tau_2 = summary(lm(NI_2 ~
> > Total_Assets))$adj.r.squared)]
> >
> >
> >   adj_r2[, Year := as.integer(year)]
> >
> >   adj_r2
> >
> > }
> >
> > DT <- data.table(NI_1 = rnorm(1000),
> >                  NI_2 = rnorm(1000),
> >                  Total_Assets = rnorm(1000))
> >
> > test_fun(DT, 2000)
> >
> > This gives me the following error on my windows machine:
> >
> > Error in `[.data.table`(adj_r2, , `:=`(Year, as.integer(year))) :
> >   It appears that at some earlier point, names of this data.table have
> > been
> > reassigned. Please ensure to use setnames() rather than names<- or
> > colnames<-. Otherwise, please report to datatable-help.
> >
> > My sessionInfo():
> >
> > R version 2.15.1 (2012-06-22)
> > Platform: x86_64-pc-mingw32/x64 (64-bit)
> >
> > locale:
> > [1] LC_COLLATE=German_Germany.1252  LC_CTYPE=German_Germany.1252
> >  LC_MONETARY=German_Germany.1252 LC_NUMERIC=C
> >  LC_TIME=German_Germany.1252
> >
> > attached base packages:
> > [1] stats     graphics  grDevices utils     datasets  methods   base
> >
> > other attached packages:
> > [1] data.table_1.8.2
> >
> > loaded via a namespace (and not attached):
> > [1] tools_2.15.1
> >
> > Interestingly, on my Linux machine, everything works fine:
> >
> > Output there:
> >            Tau_1         Tau_2 Year
> > 1: -0.0006947528 -0.0005516822 2000
> >
> > sessionInfo()
> >
> > R version 2.15.1 (2012-06-22)
> > Platform: x86_64-pc-linux-gnu (64-bit)
> >
> > locale:
> >  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
> > LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
> > LC_MONETARY=en_US.UTF-8
> >  [6] LC_MESSAGES=en_US.UTF-8    LC_PAPER=C                 LC_NAME=C
> >            LC_ADDRESS=C               LC_TELEPHONE=C
> > [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
> >
> > attached base packages:
> > [1] stats     graphics  grDevices utils     datasets  methods   base
> >
> > other attached packages:
> > [1] iccFunctions_0.0.4 roxygen2_2.2.2     digest_0.5.2       dyn_0.2-8.1
> >      zoo_1.7-7          lubridate_1.1.0    data.table_1.8.2
> >
> > loaded via a namespace (and not attached):
> > [1] brew_1.0-6      grid_2.15.1     lattice_0.20-10 plyr_1.7.1
> >  stringr_0.6.1   tools_2.15.1
> >
> > Therefore, could someone with a Windows machine confirm this error?
> > Matthew, do you have an idea what is causing this?
> >
> > Thanks in advance,
> >
> > Christoph
> > _______________________________________________
> > 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
>
>
>
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