1. What does "common" mean? (noting that 39.35 != 39.33 ) 2. But: ?"[" ## or easier, but less flexible ?subset
Also, spend some time with "An Introduction to R." Unless I misunderstand, this is very basic, and you need to first put in some time to learn R's basic procedures instead of posting here. Hint: > x <- data.frame(a = sample(1:3,10,rep=TRUE), b = sample(letters[1:10],10)) > x[x$a == 3,] Cheers, Bert On Tue, Jun 11, 2013 at 8:45 AM, Ellie Papazisi <elliepapaz...@gmail.com> wrote: > Hello, I'm trying to extract the common rows from a data frame, which is > something like this : > > > * DEPTH SALINITY DEPTH SALINITY* > *18 87 39.06 94 39.06* > *19 173 39.05 141 NA* > *20 260 39.00 188 39.07* > *21 312 38.97 207 39.03* > *22 1 39.36 1 39.35* > *23 10 39.36 10 39.33* > *24 20 39.36 20 39.33* > *25 30 39.35 30 39.33* > * > * > i want to extract the rows with the same depth. > i cannot do something like *data.frame[22:25,]* because i have lots of rows > > any help? > thank you > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.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.
