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.

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