rle {base}R Documentation

Run Length Encoding

Description

Compute the lengths and values of runs of equal values in a vector – or the reverse operation.

Usage

rle(x)
inverse.rle(x, ...)

Arguments

x a simple vector for rle() or an object of class "rle" for inverse.rle().
... further arguments which are ignored in R.

Value

rle() returns an object of class "rle" which is a list with components

lengths an integer vector containing the length of each run.
values a vector of the same length as lengths with the corresponding values.


inverse.rle() is the inverse function of rle().

Examples

x <- rev(rep(6:10, 1:5))
rle(x)
## lengths [1:5]  5 4 3 2 1
## values  [1:5] 10 9 8 7 6

z <- c(TRUE,TRUE,FALSE,FALSE,TRUE,FALSE,TRUE,TRUE,TRUE)
rle(z)
rle(as.character(z))

stopifnot(x == inverse.rle(rle(x)),
          z == inverse.rle(rle(z)))
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