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\name{dsRMatrix-class}
\title{Symmetric Sparse Compressed Row Matrices}
\docType{class}
\alias{dsRMatrix-class}
\description{The \code{dsRMatrix} class is a class of symmetric, sparse
matrices in the compressed, row-oriented format. In this
implementation the non-zero elements in the rows are sorted into
increasing row order.
}
\section{Objects from the Class}{
These classes are currently still mostly unimplemented!
Objects can be created by calls of the form \code{new("dsRMatrix", ...)}
or \code{new("dtRMatrix", ...)}.
}
\section{Slots}{
\describe{
\item{\code{uplo}:}{A character object indicating if the upper
triangle (\code{"U"} or \code{"u"}) or the lower triangle
(\code{"L"} or \code{"l"}) is stored. At present only the lower
triangle form is allowed.}
%% FIXME: this was by copy-paste-edit: is it ok?
\item{\code{j}:}{Object of class \code{"integer"} of length
\code{nnzero} (number of non-zero elements). These are the row
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. (Only present in the \code{dsRMatrix} class.)}
\item{\code{factors}:}{Object of class \code{"list"} - a list
of factorizations of the matrix. }
\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 - must be an integer vector with exactly two
non-negative values.}
\item{\code{Dimnames}:}{List of length two, see \code{\link{Matrix}}.}
}
}
\section{Extends}{
Class \code{"dgRMatrix"}, directly.
Class \code{"dsparseMatrix"}, by class \code{"dgRMatrix"}.
Class \code{"dMatrix"}, by class \code{"dgRMatrix"}.
Class \code{"sparseMatrix"}, by class \code{"dgRMatrix"}.
Class \code{"Matrix"}, by class \code{"dgRMatrix"}.
Class \code{"Matrix"}, by class \code{"dgRMatrix"}.
}
\section{Methods}{
No methods currently with class \code{"dsRMatrix"} in the signature.
% \describe{
% \item{solve}{\code{signature(a = "dsRMatrix", b = "matrix")}: Solve
% a linear system of equations defined by \code{x} using a Cholesky
% decomposition.}
% ......
% \item{coerce}{\code{signature(from = "dsRMatrix", to = "dgTMatrix")}}
% ......
% }
}
%\references{}
%\author{}
%\note{}
\seealso{
the classes \code{\linkS4class{dgCMatrix}},
\code{\linkS4class{dgTMatrix}}, and \code{\linkS4class{dgeMatrix}}.
}
\examples{
m0 <- new("dsRMatrix")
## FIXME: print() fails
m2 <- new("dsRMatrix", x = 0+1:4, Dim = as.integer(c(2,2)))
## FIXME: print() fails
str(m2)
if(FALSE)## FIXME
str(m3 <- as(Matrix(diag(2)), "dsRMatrix"))
}
\keyword{classes}
\keyword{algebra}
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