Hi, Try this: The last part was not clear. A.df<-read.table(text=" a c 0.9 b x 0.8 b z 0.5 c y 0.9 c x 0.7 c z 0.6 ",sep="",header=FALSE,stringsAsFactors=FALSE) lst1<-split(A.df[,-1],A.df$V1) lst1 #$a # V2 V3 #1 c 0.9 # #$b # V2 V3 #2 x 0.8 #3 z 0.5 # #$c # V2 V3 #4 y 0.9 #5 x 0.7 #6 z 0.6
A.K. ----- Original Message ----- From: Nuri Alpay Temiz <alpayte...@outlook.com> To: R-help@r-project.org Cc: Sent: Tuesday, January 15, 2013 12:10 PM Subject: [R] grouping elements of a data frame Hi everyone, I have a question on selecting and grouping elements of a data frame. For example: A.df<- [ a c 0.9 b x 0.8 b z 0.5 c y 0.9 c x 0.7 c z 0.6] I want to create a list of a data frame that gives me the unique values of column 1 of A.df so that i can create intersects. That is: B[a]<- [ c 0.9] B[b]<- [ x 0.8 z 0.5] B[c]<- [ y 0.9 x 0.7 z 0.6] B[c] n B[b] <- c(x,z) How can I accomplish this? Thanks, Al ______________________________________________ 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. ______________________________________________ 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.
