# [R] Indexing vector with repeated values

Uwe Ligges ligges at statistik.uni-dortmund.de
Fri May 26 09:46:10 CEST 2006

```Andris Jankevics wrote:

> Hi all,
> I have a vector which contains many repeated values.
>
>
>>Z <- c(1,2,3,4,5,1,2,3,4,5,1,2,3,5,5,2,3,4,5)
>
>
> I need to know how many times each number in this vecetor is repeated.
> I can use a command like this:
>
>
>>table (cut(Z,seq(1,5,1)))

Why not simply
table(Z)
?

>
> (1,2] (2,3] (3,4] (4,5]
>     4     4     3     5
>
> But how can I find a break points for vector with random values and random
> number sequence intervals? Why result for interval (1,2) is 4, if there is
> only 3 values of "1"?

There is no "1" counted, but 4 "2"s, you have not specified an interval
with 1 in it.
You were looking for
table(cut(Z,seq(0,5,1)))
but don't need cut() here at all.

> Can I get from vector Z a smal vector Zs 1,2,3,4,5 ?

seq(min(Z), max(Z))

Uwe Ligges

>
> Thanks a lot!
>
> Andris Jankevics
>
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