Arun, Im pretty sure `rbindlist` identifies column class based on the first argument.
compare rbindlist(list(DT2, DT1)) rbindlist(list(DT1, DT2)) I agree with you though that a more ideal behavior would be one that mimics `c( )` -Rick On Sat, Jul 27, 2013 at 3:07 PM, Arunkumar Srinivasan <[email protected] > wrote: > Hi all, > > Here's a behaviour of `rbindlist` that I came across that I think is > undesirable. If the columns to be "rbind" are of type "integer" and > "numeric", then, the class "integer" is retained which results in different > results than intended. > > require(data.table) > DT1 <- data.table(x = 1:5, y = 1:5) > x y > 1: 1 1 > 2: 2 2 > 3: 3 3 > 4: 4 4 > 5: 5 5 > > DT2 <- data.table(x = 6:10, y = 1:5/10) > x y > 1: 6 0.1 > 2: 7 0.2 > 3: 8 0.3 > 4: 9 0.4 > 5: 10 0.5 > > sapply(DT1, class) > x y > "integer" "integer" > > sapply(DT2, class) > x y > "integer" "numeric" > > rbindlist(list(DT1, DT2)) > x y > 1: 1 1 > 2: 2 2 > 3: 3 3 > 4: 4 4 > 5: 5 5 > 6: 6 0 <~~~~ from here, the result should be 0.1 to 0.5 for the next 5 > rows or y. > 7: 7 0 > 8: 8 0 > 9: 9 0 > 10: 10 0 > > Is this behaviour unexpected or we've to manually take care of this? Seems > more proper to be taken care of internally to me though. > > Best, > Arun. > > > _______________________________________________ > datatable-help mailing list > [email protected] > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help >
_______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
