1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
\name{isplit}
\alias{isplit}
\title{Split Iterator}
\description{
Returns an iterator that divides the data in the vector \code{x}
into the groups defined by \code{f}.
}
\usage{
isplit(x, f, drop=FALSE, \dots)
}
\arguments{
\item{x}{vector or data frame of values to be split into groups.}
\item{f}{a factor or list of factors used to categorize \code{x}.}
\item{drop}{logical indicating if levels that do not occur should be dropped.}
\item{\dots}{current ignored.}
}
\value{
The split iterator.
}
\seealso{
\code{\link{split}}
}
\examples{
x <- rnorm(200)
f <- factor(sample(1:10, length(x), replace=TRUE))
it <- isplit(x, f)
expected <- split(x, f)
for (i in expected) {
actual <- nextElem(it)
stopifnot(actual$value == i)
}
}
\keyword{utilities}
|
