[R] counting numbers without replicates in a vector
Yu Shao
yshao at wadsworth.org
Thu Dec 16 23:01:07 CET 2004
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
>
>
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