Last element of a vector by group
? duplicated !duplicated(a.ord, fromLast = TRUE) HTH, Michael
On Tue, May 15, 2012 at 9:37 PM, Axel Urbiz <axel.urbiz at gmail.com> wrote:
Dear List, How can I get a logical vector as shown by a.ord.last below (i.e., it is FALSE whenever there are subsequent equal values of an ordered vector and FALSE otherwise)? a <- c(1,1,2,1,3,4,3,5,6) a.ord <- a[order(a)] a.ord a.ord.last <- c(F, F, T, T, F, T, T, T, T) Thanks for any help Axel. ? ? ? ?[[alternative HTML version deleted]]
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