On 2012-10-07 10:50, arun wrote:
Hi,Though, this does give the result you wanted when the column names are the same. y1<-y colnames(y1)<-c("a","b") merge(x,y1,by="a",all=TRUE,suffixes=c("",".y")) # a b b.y #1 1 4 a #2 2 5 b #3 3 6 <NA> A.K.
Yes, because 'b' is _not_ a 'by'-name. Peter Ehlers
----- Original Message ----- From: Sam Steingold <s...@gnu.org> To: r-help@r-project.org Cc: Sent: Sunday, October 7, 2012 11:34 AM Subject: [R] a merge() problem 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.
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