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). Peter Ehlers
(when I omit suffixes, the result is the same). Thanks.
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