Excuse me, One comment on my question: start and end variables are dates: DT <-
data.table(ID=c(1,2,3),
start=as.Date(c("1985-01-01","1993-07-15","1993-05-17")),
end=as.Date(c("1992-05-01","1997-02-25","2002-01-01")), value=c(7.8, 3.2,
20)) Thanks!! _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
