[R] counting repeating sequence lengths in a vector

[Henrique Dallazuanna]

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
>
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>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O