maybe the following is what you're looking for: lead.dat[!duplicate(rownames(lead.dat)), ]
lead.dat[duplicate(rownames(lead.dat)), ] 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 Quoting Ethan Johnsons <[EMAIL PROTECTED]>: > # R 2.3.1 > > I read the data set into R, but the data set have two rows per record. > > i.e. > > ......... > 105 1 1 1103 1 5 4 8 5 22 > 105 2 2 2 2 1 2 17 16 26 > 106 1 2 606 1 5 12 11 9 37 > 106 2 2 2 2 2 2 16 14 29 > 107 1 3 611 1 7 9 10 7 33 > 107 2 2 2 2 2 2 10 13 29 > ........... > > How do you extract the certain columns on the first row set of each? > > Tthe first row set are like: > 105 1 1 1103 1 5 4 8 5 22 > 106 1 2 606 1 5 12 11 9 37 > 107 1 3 611 1 7 9 10 7 33 > > so, nothing gets imported from the second row set. > > 105 2 2 2 2 1 2 17 16 26 > 106 2 2 2 2 2 2 16 14 29 > 107 2 2 2 2 2 2 10 13 29 > I tried: > >> a <- subset(lead.dat, rownumber==1) > Error in eval(expr, envir, enclos) : object "rownumber" not found >> b <- subset(lead.dat, rownumber==2) > Error in eval(expr, envir, enclos) : object "rownumber" not found > > What is wrong with this? > thx much > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] 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 ______________________________________________ [email protected] 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.
