Bernd Weiss <[EMAIL PROTECTED]> wrote: > I have two data.frames a and b: > > i <- c(1,1,2,2,3,3,4,4) > x <- c(1,53,7,3,4,23,6,2) > a <- data.frame(i,x) > > and > > j <- c(1,2,3,4) > y <- c(99,88,77,66) > b <- data.frame(j,y) > Now, I would like to match 'b' to 'a', so that a new data.frame 'c' is > > > c > i x z > 1 1 1 99 > 2 1 53 99 > 3 2 7 88 > 4 2 3 88 > 5 3 4 77 > 6 3 23 77 > 7 4 6 66 > 8 4 2 66
Merge should do the job: > merge(a,b,by=1) i x y 1 1 1 99 2 1 53 99 3 2 7 88 4 2 3 88 5 3 4 77 6 3 23 77 7 4 6 66 8 4 2 66 -- Philippe Glaziou ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help