[R] counting numbers without replicates in a vector
MSchwartz at MedAnalytics.com
Thu Dec 16 23:10:09 CET 2004
On Thu, 2004-12-16 at 13:40 -0800, Jun Ding wrote:
> I am just wondering if there is an easy way to count
> in a numeric vector how many numbers don't have
> For example,
> a=c(1,1,2,2,3,4,5), how can I know there are three
> numbers (3, 4 and 5) without replicates?
> Thank you!
> as.vector(which(table(a) == 1))
 3 4 5
More information about the R-help