Dear all, I have a dataframe with two columns, where NUMBER is the number of occurrences of DEPTH:
DEPTH NUMBER 1 2 1 2 3 2 3 2 3 4 5 1 > a<-data.frame(c(2,3,2,5),c(1,2,3,1)) > colnames(a)=c("DEPTH","NUMBER") I want a column or a vector where all the DEPTHs are listed: 2, 3, 3, 2, 2, 2, 5 (NUMBER=1 in all cases). Is there any simple solution to the problem? Thanks, Jonas Jonas Fransson Ph.D.stud. IVA / Det Informationsvidenskabelige Akademi Royal School of Library and Information Science Birketinget 6 DK-2300 Copenhagen S T +45 32 58 60 66 D +45 32 34 15 10 www.iva.dk/jf ______________________________________________ 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.