[R] determine length of sequence of equal elements in a vector
Jannis
bt_jannis at yahoo.de
Sat Dec 18 18:33:21 CET 2010
Thanks a lot, Duncan.
Duncan Murdoch schrieb:
> On 18/12/2010 12:21 PM, Jannis wrote:
>> Dear list members,
>>
>>
>> I am seeking a function that returns me the length of a continous
>> sequence of identical elements in a vector. Something like (or
>> similar to):
>>
>>
>> example = c(1,1,1,2,2,3,3,3,3)
>>
>>
>> result = c(3,3,3,2,2,4,4,4,4)
>>
>>
>> I am quite sure there already exists a function to do this, I just cant
>> figure out its name. Otherwise I would start programming my own
>> function.
>
> The rle() function produces the data in a different format. Together
> with rep() you can get what you want:
>
> x <- rle(example)
> rep(x$lengths, x$lengths)
>
> Duncan Murdoch
>
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