[R] counting numbers without replicates in a vector

Jun Ding dingjun_cn at yahoo.com
Thu Dec 16 22:40:32 CET 2004

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!



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