[R] Indexing vector with repeated values

[Uwe Ligges]

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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