try this: dt[dt$a %in% 2:4, ]
I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "Dong-hyun Oh" <[EMAIL PROTECTED]> To: "R-help" <[EMAIL PROTECTED]> Sent: Wednesday, October 24, 2007 11:44 AM Subject: [R] subset data.frame with constraint of many values? > Dear UseRs, > > Let us assume that I have data.frame named as dt. > > dt is as follows: > > a b c d > 1 3 4 5 > 2 3 3 2 > 1 3 4 2 > 3 2 4 5 > 4 5 3 6 > 3 2 5 7 > 2 5 7 8 > ..................... > ..................... > > I want to subset dt with fileds a having 2 or 3 or 4, and I wrote > following code. > > dt[dt$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. > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________ 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.
