R help - Feb 2010 - counting repeating sequence lengths in a vector

Hello,
I have a very long (~50,000) sequence of repeating numbers.  The first 
100 are:

[1]     0     0     0     0     0     0     0     0     0     0     0   429
  [13]   429   429   429   429   429   429   429   858   858   858   858 
   858
  [25]   858  1287  1287  1287  1287  1287  1716  2145  2145  2574  2574 
  3003
  [37]  3003  3432  3432  3861  4290  4719  5148  5577  5577  6006  6006 
  6006
  [49]  6435  6435  6435  6864  6864  7293  7293  7293  7722  7722  7722 
  7722
  [61]  8151  8151  8151  8580  8580  8580  9009  9009  9009  9009  9438 
  9438
  [73]  9438  9438  9867  9867  9867 10296 10296 10296 10725 10725 10725 
10725
  [85] 11154 11154 11154 11154 11154 11583 11583 11583 11583 12012 12012 
12012
  [97] 12012 12441 12441 12441


What I want is to produce a vector of lengths for each contiguous run of 
numbers . i.e. for the above example, the first three items of the 
vector returned would be:

11 8 6

...to represent the counts of 0, 429, and 585, respectively.  I could do 
this with unique() and a for loop, but this would be very inefficient. 
Any advice on how to do this efficiently would be most appreciated.

thanks
Tony

Try this:

rle(x)$length


On Mon, Feb 22, 2010 at 2:27 PM, Larson, TR <trl1 at york.ac.uk>
wrote:
> Hello,
> I have a very long (~50,000) sequence of repeating numbers. ?The first 100
> are:
>
> [1] ? ? 0 ? ? 0 ? ? 0 ? ? 0 ? ? 0 ? ? 0 ? ? 0 ? ? 0 ? ? 0 ? ? 0 ? ? 0 ? 429
> ?[13] ? 429 ? 429 ? 429 ? 429 ? 429 ? 429 ? 429 ? 858 ? 858 ? 858 ? 858
?858
> ?[25] ? 858 ?1287 ?1287 ?1287 ?1287 ?1287 ?1716 ?2145 ?2145 ?2574 ?2574
> ?3003
> ?[37] ?3003 ?3432 ?3432 ?3861 ?4290 ?4719 ?5148 ?5577 ?5577 ?6006 ?6006
> ?6006
> ?[49] ?6435 ?6435 ?6435 ?6864 ?6864 ?7293 ?7293 ?7293 ?7722 ?7722 ?7722
> ?7722
> ?[61] ?8151 ?8151 ?8151 ?8580 ?8580 ?8580 ?9009 ?9009 ?9009 ?9009 ?9438
> ?9438
> ?[73] ?9438 ?9438 ?9867 ?9867 ?9867 10296 10296 10296 10725 10725 10725
> 10725
> ?[85] 11154 11154 11154 11154 11154 11583 11583 11583 11583 12012 12012
> 12012
> ?[97] 12012 12441 12441 12441
>
>
> What I want is to produce a vector of lengths for each contiguous run of
> numbers . i.e. for the above example, the first three items of the vector
> returned would be:
>
> 11 8 6
>
> ...to represent the counts of 0, 429, and 585, respectively. ?I could do
> this with unique() and a for loop, but this would be very inefficient. Any
> advice on how to do this efficiently would be most appreciated.
>
> thanks
> Tony
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O