a <- 1:20 tt <- ifelse(a > 10, "A", ifelse(a > 5, "B", "C"))
The problem you have is with '5 < a <= 10'. Such double sided inequalities are used in mathematics but not in R. Here you only need the first part, but if you did need both you would need to write 5 < a & a <= 10 Look carefully and spot the difference. Bill Venables CSIRO/CMIS Cleveland Laboratories -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Chunhao Sent: Tuesday, 23 February 2010 12:13 PM To: r-help@r-project.org Subject: [R] Use 2 "ifelse" to sort data Dear R users, I have a question how to use 2 "ifelse" to sort my data. Such as from 11 to 20 assign to A; 6 to 10 assign to B, and the rest of them assign to C a<-1:20 tt<-ifelse(a>10, "A",no=ifelse( 5< a <=10, "B", "C")) Many Thanks Chunhao -- View this message in context: http://n4.nabble.com/Use-2-ifelse-to-sort-data-tp1565422p1565422.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
