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\name{iapply}
\alias{iapply}
\title{Array/Apply Iterator}
\description{
Returns an iterator over an array, which iterates over the
array in much the same manner
as the \code{apply} function.
}
\usage{
iapply(X, MARGIN)
}
\arguments{
\item{X}{the array to iterate over.}
\item{MARGIN}{a vector of subscripts.
\code{1} indicates the first dimension (rows), \code{2}
indicates the second dimension (columns), etc.}
}
\value{
The apply iterator.
}
\seealso{
\code{\link{apply}}
}
\examples{
a <- array(1:8, c(2, 2, 2))
# iterate over all the matrices
it <- iapply(a, 3)
as.list(it)
# iterate over all the columns of all the matrices
it <- iapply(a, c(2, 3))
as.list(it)
# iterate over all the rows of all the matrices
it <- iapply(a, c(1, 3))
as.list(it)
}
\keyword{utilities}
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