Hi! I have a large dataframe that I want to extract a subset from. This subset has a certain column value that matches elements in a vector I have defined. So, my question is how do I get the rows that match one of the elements in the vector.
Example: a = c(1:5) b = letters[1:10] df = data.frame(ind = a, letrs = b) > df ind letrs 1 1 a 2 2 b 3 3 c 4 4 d 5 5 e 6 1 f 7 2 g 8 3 h 9 4 i 10 5 j > # Now I want to extract all of the rows where ind == 2, 4 or 5. # This would be rows 2, 4, 5, 7, 9 and 10 subgr = c(2,4,6) My most natural inclination would be to do df[df$ind == subgr,] However, this does not work: > df[df$ind == subgr,] ind letrs 7 2 g Warning message: In df$ind == subgr : longer object length is not a multiple of shorter object length > So, which part of this is it that I have misunderstood? Thanks for your help btw! Karin -- Karin Lagesen, PhD student [EMAIL PROTECTED] http://folk.uio.no/karinlag ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
