[datatable-help] possible bug when running setkey on POSIXct column

[Erik Iverson]

Jim, what platform are you on? I can reproduce on Linux (and indeed
recently saw something similar with my own data).

Best,
--Erik

On Fri, Jan 18, 2013 at 3:45 PM, jim holtman <jholtman at gmail.com> wrote:
>
> seems to work for me:
>
> > library(data.table)
> data.table 1.8.6  For help type: help("data.table")
> > DT = data.table(X=as.POSIXct(
> > c(rep("15DEC2008:00:00:00",10),"15DEC2008:00:00:00",rep("17DEC2008:00:00:00",2)),format="%d%b%Y:%H:%M:%S"),Y=c(1534,61,74,518,519,1519,1520,1524,3127,29250,30609,43,7853))
> > setkey(DT,X,Y)
> > DT
>              X     Y
>  1: 2008-12-15    61
>  2: 2008-12-15    74
>  3: 2008-12-15   518
>  4: 2008-12-15   519
>  5: 2008-12-15  1519
>  6: 2008-12-15  1520
>  7: 2008-12-15  1524
>  8: 2008-12-15  1534
>  9: 2008-12-15  3127
> 10: 2008-12-15 29250
> 11: 2008-12-15 30609
> 12: 2008-12-17    43
> 13: 2008-12-17  7853
>
>
> On Fri, Jan 18, 2013 at 9:44 AM, statquant <statquant at outlook.com> wrote:
> > Hello I might have found a bug.
> > I really cannot explain the following (please be indulgent as I narrowed
> > the
> > most I could).
> >
> > library(data.table)
> > DT = data.table(X=as.POSIXct(
> >
> > c(rep("15DEC2008:00:00:00",10),"15DEC2008:00:00:00",rep("17DEC2008:00:00:00",2)),format="%d%b%Y:%H:%M:%S"),Y=c(1534,61,74,518,519,1519,1520,1524,3127,29250,30609,43,7853))
> > setkey(DT,X,Y)
> >
> > #Here is what I see after the sort
> >
> > DT
> >              X     Y
> >  1: 2008-12-15  1534
> >  2: 2008-12-15    61
> >  3: 2008-12-15    74
> >  4: 2008-12-15   518
> >  5: 2008-12-15   519
> >  6: 2008-12-15  1519
> >  7: 2008-12-15  1520
> >  8: 2008-12-15  1524
> >  9: 2008-12-15  3127
> > 10: 2008-12-15 29250
> > 11: 2008-12-15 30609
> > 12: 2008-12-17    43
> > 13: 2008-12-17  7853
> >
> > #I thought that it was a POSIXct problem but if I can get the correct
> > answer
> > like this:
> >
> > DT[order(X,Y),]
> >              X     Y
> >  1: 2008-12-15    61
> >  2: 2008-12-15    62
> >  3: 2008-12-15    74
> >  4: 2008-12-15   518
> >  5: 2008-12-15   519
> >  6: 2008-12-15  1519
> >  7: 2008-12-15  1520
> >  8: 2008-12-15  1524
> >  9: 2008-12-15  3127
> > 10: 2008-12-15 29250
> > 11: 2008-12-15 30609
> > 12: 2008-12-17    43
> > 13: 2008-12-17  7853
> >
> > #Here is my session (just launched it)
> >
> > R> sessionInfo()
> > R version 2.15.2 (2012-10-26)
> > Platform: x86_64-pc-linux-gnu (64-bit)
> >
> > locale:
> >  [1] LC_CTYPE=en_GB.UTF-8       LC_NUMERIC=C               LC_TIME=C
> >  [4] LC_COLLATE=en_GB.UTF-8     LC_MONETARY=fr_FR.UTF-8
> > LC_MESSAGES=en_GB.UTF-8
> >  [7] LC_PAPER=C                 LC_NAME=C                  LC_ADDRESS=C
> > [10] LC_TELEPHONE=C             LC_MEASUREMENT=fr_FR.UTF-8
> > LC_IDENTIFICATION=C
> >
> > attached base packages:
> > [1] stats     graphics  grDevices datasets  utils     methods   base
> >
> > other attached packages:
> > [1] data.table_1.8.7 inline_0.3.10    Rcpp_0.10.2      vimcom_0.9-5
> > setwidth_1.0-2
> > [6] colorout_0.9-9
> >
> >
> >
> > _______________________________________________
> > 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
>
>
>
> --
> Jim Holtman
> Data Munger Guru
>
> What is the problem that you are trying to solve?
> Tell me what you want to do, not how you want to do it.
> _______________________________________________
> 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