Dear UseRs, Let us assume that I have data.frame named as dt.
dt is as follows: a b c d 1 3 4 5 2 3 3 2 1 3 4 2 3 2 4 5 4 5 3 6 3 2 5 7 2 5 7 8 ..................... ..................... I want to subset dt with fileds a having 2 or 3 or 4, and I wrote following code. dt[dt$a == 2 | dt$a == 3 | dt$a == 4,] Is there more efficient way for subset? Thanks in advance. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.