[R] how to keep keep matching column in output of merge

How do I keep the linking column[s] in a merge()? I need to use the values again in a further merge. thanks Nevil Amos __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide

Re: [R] how to keep keep matching column in output of merge

Nevil Amos nevil.amos at gmail.com writes: How do I keep the linking column[s] in a merge()? I need to use the values again in a further merge. simple reproducible example please? (e.g. make up a couple of 4-row datasets that show what you want, what you are trying, and what you are

Re: [R] how to keep keep matching column in output of merge

Hi Nevil, We really need an example here of what you're doing, since merge() does keep the id column by default. x - data.frame(id = c(a, b, c, d), x=c(1,2,3,4)) y - data.frame(id = c(b, a, d, c), y=c(101, 102, 103, 104)) merge(x, y) id x y 1 a 1 102 2 b 2 101 3 c 3 104 4 d 4 103

Re: [R] how to keep keep matching column in output of merge

Apologies, it is there! On 5/01/2011 1:26 AM, Sarah Goslee wrote: Hi Nevil, We really need an example here of what you're doing, since merge() does keep the id column by default. x- data.frame(id = c(a, b, c, NA), x=c(1,2,3,4)) y- data.frame(id1 = c(NA, a, d, c), y=c(101, 102, 103, 104))