On Fri, Aug 20, 2010 at 11:01 AM, Ron Michael <ron_michae...@yahoo.com> wrote:
> Dear all, let suppose I have following vector:
>
>> dat1 <- c(rep("asd", 5), rep("xyz", 12), rep("erd", 17))
>> dat1 <- dat1[sample(1:length(dat1), length(dat1), replace=F)]
>> dat1
> [1] "erd" "xyz" "erd" "asd" "asd" "erd" "xyz" "asd" "erd" "erd" "asd" "xyz"
> "erd" "asd" "xyz" "xyz" "erd" "xyz" "erd"
> [20] "erd" "erd" "xyz" "xyz" "erd" "erd" "erd" "erd" "xyz" "xyz" "xyz" "erd"
> "xyz" "erd" "erd"
>
>
> Here I want to know the length of replications for each unique items viz
> "asd", "xyz", and "erd". Is there any R function available to directly
> implement that?
Like what rle does?
>> rle(dat1)
Run Length Encoding
lengths: int [1:19] 1 3 2 3 1 1 1 2 1 3 ...
values : chr [1:19] "asd" "erd" "asd" "erd" "xyz" "erd" "xyz" "erd" ...
That's saying there's 1 asd, then 3 erd, then 2 asd, and so on.
?rle for more.
Barry
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