Re: [R] Counting elements in columns

Hi, try this; sum(sapply(a, function(x) (x==b))) -- View this message in context: http://r.789695.n4.nabble.com/Re-Counting-elements-in-columns-tp3454930p3454936.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mai

Re: [R] Counting elements in columns

length(intersect(a, b)) On Sat, Apr 16, 2011 at 8:04 PM, Jim Silverton wrote: > I have two columns and I want to count hwo many pairs I have of the same > element. For example. If I have > a = c(1,2,3,4,5) > b= c(12, 1, 34, 2, 5, 0, 10, 100, 11) > It should return 3 (since 1, 2 and 5 occur in bo

Re: [R] Counting elements in columns

I have two columns and I want to count hwo many pairs I have of the same element. For example. If I have a = c(1,2,3,4,5) b= c(12, 1, 34, 2, 5, 0, 10, 100, 11) It should return 3 (since 1, 2 and 5 occur in both columns). Columns need not be of the same length. -- Thanks, Jim. [[alternati