Dong-hyun Oh wrote: > 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?
subset(dt, a %in% 2:4) > 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. -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 ______________________________________________ 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.
