[R] counting numbers without replicates in a vector

[Spencer Graves]

      Have you considered something like the following: 

 > a
[1] 1 1 2 2 3 4 5
 > sum(table(a)==1)
[1] 3     

      hope this helps.  spencer graves

Jun Ding wrote:

>Hi,
>I am just wondering if there is an easy way to count
>in a numeric vector how many numbers don't have
>replicates. 
>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!
>
>Jun
>
>
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Spencer Graves, PhD, Senior Development Engineer
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