[R] counting numbers without replicates in a vector

[Yu Shao]

table will probably do. The following is probably is what you want:

 > a <- c(1,1,2,2,3,4,5)
 > a.tab <- table (a)
 > a.tab
a
1 2 3 4 5
2 2 1 1 1
 > as.vector(which (a.tab == 1)) 
[1] 3 4 5


Cheers,
Yu

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
>
>
>=====
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>
>
>  
>