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". (when I omit suffixes, the result is the same). Thanks. -- Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000 http://www.childpsy.net/ http://palestinefacts.org http://honestreporting.com http://truepeace.org http://openvotingconsortium.org My name is Deja Vu. Have we met before?
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