Andrew Yee wrote: > Thanks. But in this specific case, I would like the output to include > all three columns, including the "ignored" column (in this case, I'd > like it to ignore column a). > df[!duplicated(df[,c("a","c")]),]
or perhaps df[!duplicated(df[-2]),] > Thanks, > Andrew > > On 7/9/07, hadley wickham <[EMAIL PROTECTED]> wrote: > >> On 7/9/07, Andrew Yee <[EMAIL PROTECTED]> wrote: >> >>> Take for example the following data.frame: >>> >>> a<-c(1,1,5) >>> b<-c(3,2,3) >>> c<-c(5,1,5) >>> sample.data.frame<-data.frame(a=a,b=b,c=c) >>> >>> I'd like to be able to use unique(sample.data.frame), but have >>> unique() ignore column a when determining the unique elements. >>> >>> However, I figured that this would be setting for incomparables=, but >>> it appears that this funcationality hasn't been incorporated. Is >>> there a work around for this, i.e. to be able to get unique to only >>> look at selected columns of a data frame? >>> >> unique(df[,c("a","c")]) ? >> >> Hadley >> >> > > ______________________________________________ > R-help@stat.math.ethz.ch 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. > -- O__ ---- Peter Dalgaard Ă˜ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-help@stat.math.ethz.ch 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.