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

[Matthew Dowle]

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
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