The R Project SVN R

\name{split}
\title{Divide into Groups}
\usage{
split(x, groups)
}
\alias{split}
\arguments{
\item{x}{vector containing the values to be divided into groups.}
\item{group}{a factor which defines the grouping.}
}
\description{
\code{split} divides the data in the vector \code{x}
into the groups defined by the factor \code{groups}.

The value returned is a list of vectors containing the values
for the groups.
The components of the list are named by the factor levels of \code{group}.
}
\examples{
n <- 10; nn <- 100
g <- factor(round(n * runif(n*nn)))
x <- rnorm(n*nn) + sqrt(codes(g))
xg <- split(x,g)
boxplot(xg, col="lavender", notch=TRUE, varwidth= TRUE)
sapply(xg, length)
sapply(xg, mean)
## Split a matrix into a list by columns
ma <- cbind(x = 1:10, y = (-4:5)^2)
split(ma, col(ma))
}