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\name{dgRMatrix-class}
\docType{class}
\alias{dgRMatrix-class}
\alias{coerce,dgRMatrix,CsparseMatrix-method}
\alias{coerce,dgRMatrix,dgCMatrix-method}
\alias{coerce,dgRMatrix,dgTMatrix-method}
\alias{coerce,dgRMatrix,matrix-method}
\alias{coerce,dgCMatrix,dgRMatrix-method}
\alias{coerce,dgTMatrix,dgRMatrix-method}
\alias{coerce,dgeMatrix,dgRMatrix-method}
\alias{coerce,matrix,dgRMatrix-method}
%\alias{coerce,dgRMatrix,dgeMatrix-method}
\alias{diag,dgRMatrix-method}
\alias{dim,dgRMatrix-method}
\alias{image,dgRMatrix-method}
\alias{t,dgRMatrix-method}
\title{Compressed, sparse, row-oriented numeric matrices}
\description{The \code{dgRMatrix} class is a class of sparse numeric
matrices in the compressed, sparse, column-oriented format. In this
implementation the non-zero elements in the columns are sorted into
increasing row order.
\bold{Note:} Currently, the column-oriented sparse classes, e.g.,
\code{\linkS4class{dgCMatrix}}, are preferred and better supported in
the \pkg{Matrix} package.
}
\section{Objects from the Class}{
Objects can be created by calls of the form \code{new("dgRMatrix", ...)}.
}
\section{Slots}{
\describe{
\item{\code{j}:}{Object of class \code{"integer"} of length nnzero
(number of non-zero elements). These are the column numbers for
each non-zero element in the matrix.}
\item{\code{p}:}{Object of class \code{"integer"} of pointers, one
for each row, to the initial (zero-based) index of elements in
the row.}
\item{\code{x}:}{Object of class \code{"numeric"} - the non-zero
elements of the matrix.}
\item{\code{Dim}:}{Object of class \code{"integer"} - the dimensions
of the matrix.}
}
}
\section{Methods}{
\describe{
\item{coerce}{\code{signature(from = "matrix", to = "dgRMatrix")}}
\item{coerce}{\code{signature(from = "dgRMatrix", to = "matrix")}}
\item{coerce}{\code{signature(from = "dgRMatrix", to = "dgTMatrix")}}
\item{diag}{\code{signature(x = "dgRMatrix")}: returns the diagonal
of \code{x}}
\item{dim}{\code{signature(x = "dgRMatrix")}: returns the dimensions
of \code{x}}
\item{image}{\code{signature(x = "dgRMatrix")}: plots an image of
\code{x} using the \code{\link[lattice]{levelplot}} function}
}
}
\seealso{
the \code{\linkS4class{dgCMatrix}} class.
}
\keyword{classes}
\keyword{algebra}
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