\name{qr-methods}
\docType{methods}
\alias{qr-methods}
\alias{qr,dgCMatrix-method}
\title{Methods for the qr generic}
\description{
The \code{"Matrix"} package provides methods for the QR decomposition
of special classes of matrices. The generic function is
\code{\link[base]{qr}} but methods defined in this package can take
extra arguments. In particular there is an option for determining a
fill-reducing permutation of the columns of a sparse, rectangular matrix.
}
\section{Methods}{
\describe{
\item{x = "dgCMatrix"}{QR decomposition of a general sparse
double-precision matrix with \code{nrow(x) >= ncol(x)}. Returns
an object of class \code{"sparseQR"}, see
\code{\linkS4class{sparseQR}}.
}
}
}
\seealso{\code{\link[base]{qr}}, \code{\linkS4class{sparseQR}},
\code{\linkS4class{dgCMatrix}}}
\keyword{methods}
\keyword{algebra}
\keyword{array}