On Apr 3, 2015, at 5:09 AM, Wing Keong Lew wrote: > Hi, > > Is it a requirement to provide the break intervals of the cut function in > ascending order?
Apparently not. I get teh sam splits even with random permutations. It is apparently a "requirement" to make sure you labels match the sorted order of the breaks. The findInterval function does require that its `vec` argument be non-decreasing, but I do not see a discussion of break order in the help page. Looking at cut.default the first think it does to the breaks is sort them. #... snipped code that deals with length(breaks)==1 else nb <- length(breaks <- sort.int(as.double(breaks))) -- David. > The help documentation for cut didn't specify this but the labels returned > are reversed if I indicate the break intervals in a descending order. Here is > an example > > tbl<-data.frame(x=c(0:10)) > tbl$ascending<-cut(tbl$x, breaks=c(0,3,5,9,99), > labels=c('<3','4-5','6-9','>9'), include.lowest=T) > tbl$descending<-cut(tbl$x, breaks=c(99,9,5,3,0), > labels=c('>9','6-8','4-5','<3'), include.lowest=T) > tbl > x ascending descending > 1 0 <3 >9 > 2 1 <3 >9 > 3 2 <3 >9 > 4 3 <3 >9 > 5 4 4-5 6-8 > 6 5 4-5 6-8 > 7 6 6-9 4-5 > 8 7 6-9 4-5 > 9 8 6-9 4-5 > 10 9 6-9 4-5 > 11 10 >9 <3 > > Appreciate any guidance on this. > Regards > Wing Keong > > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. David Winsemius Alameda, CA, USA ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.