The R Project SVN R

\name{rle}
\title{Run Length Encoding}
\alias{rle}
\alias{inverse.rle}
\alias{print.rle}
\description{
  Compute the lengths and values of runs of equal values in a vector
  -- or the reverse operation.
}
\usage{
rle(x)
inverse.rle(x, \dots)
}
\arguments{
  \item{x}{a simple vector for \code{rle()} or an object of class
    \code{"rle"} for \code{inverse.rle()}.}
  \item{\dots}{further arguments which are ignored in \R.}
}
\value{
  \code{rle()} returns an object of class \code{"rle"} which is a list
  with components
  \item{lengths}{an integer vector containing the length of each run.}
  \item{values}{a vector of the same length as \code{lengths} with the
    corresponding values.}

  \code{inverse.rle()} is the inverse function of \code{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)))
}
\keyword{manip}