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Tip revision: 221c01351418a949331ba45a2a39ebdb72ca657d authored by Martin Maechler on 18 January 2015, 00:00:00 UTC
version 1.1-5
version 1.1-5
Tip revision: 221c013
expand.Rd
\name{expand}
\title{Expand a Decomposition into Factors}
\usage{
expand(x, \dots)
}
\alias{expand}
\description{
Expands decompositions stored in compact form into factors.
}
\arguments{
\item{x}{a matrix decomposition.}
\item{\dots}{further arguments passed to or from other methods.}
}
\value{
The expanded decomposition, typically a list of matrix factors.
}
\details{
This is a generic function with special methods for different types
of decompositions, see \code{\link{showMethods}(expand)} to list them
all.
}
\note{
Factors for decompositions such as \code{lu} and \code{qr} can be
stored in a compact form.
The function \code{expand} allows all factors to be fully expanded.
}
\seealso{
The LU \code{\link{lu}}, and the \code{\link{Cholesky}}
decompositions which have \code{expand} methods;
\code{\link{facmul}}.
}
\examples{
(x <- Matrix(round(rnorm(9),2), 3, 3))
(ex <- expand(lux <- lu(x)))
}
\keyword{algebra}