> * Peter Ehlers <ruy...@hpnytnel.pn> [2012-10-07 10:03:42 -0700]: > > On 2012-10-07 08:34, Sam Steingold wrote: >> I know it does not look very good - using the same column names to mean >> different things in different data frames, but here you go: >> --8<---------------cut here---------------start------------->8--- >>> x <- data.frame(a=c(1,2,3),b=c(4,5,6)) >>> y <- data.frame(b=c(1,2),a=c("a","b")) >>> merge(x,y,by.x="a",by.y="b",all.x=TRUE,suffixes=c("","y")) >> a b a >> 1 1 4 a >> 2 2 5 b >> 3 3 6 <NA> >> Warning message: >> In merge.data.frame(x, y, by.x = "a", by.y = "b", all.x = TRUE) : >> column name 'a' is duplicated in the result >> --8<---------------cut here---------------end--------------->8--- >> why is the suffixes argument ignored? >> I mean, I expected that the second "a" to be "a.y". > > The 'suffixes' argument refers to _non-by_ names only (as per ?merge).
yes, but "a" in "y" is _not_ a by-name. -- Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000 http://www.childpsy.net/ http://americancensorship.org http://think-israel.org http://www.memritv.org http://mideasttruth.com Save time: send elected officials to jail directly, bypassing the office. ______________________________________________ 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.