Ignore me I am being stupid!
On Tue, May 15, 2012 at 12:04 PM, Chris Neff <[email protected]> wrote: > Hey all, > > Using the latest version, I get the following: > > >> dt=data.table(x=1:10,y=rnorm(10)) > >> dt[,list(count=.N),keyby=c("x","y")] > Finding groups (bysameorder=FALSE) ... done in 0.003 secs > Detected that j uses these columns (the rest, if any, are ignored for > efficiency): > Starting dogroups ... > testj evaluates to a list with names, this may slow down grouping... > done dogroups in 0.002 secs > x y count > [1,] 1 -0.43990011 1 > [2,] 2 -0.74863035 1 > [3,] 3 0.06791443 1 > [4,] 4 0.32678061 1 > [5,] 5 -0.77222679 1 > [6,] 6 0.03435628 1 > [7,] 7 0.35011434 1 > [8,] 8 -0.46384714 1 > [9,] 9 0.32989082 1 > [10,] 10 -0.76977285 1 > > > Note that the y values aren't sorted right. This output does have x > and y as keys though, and the data.table is left in a state with keys > that aren't sorted. Unless I misunderstand keyby, this is a bug no? > > -Chris _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
