Revision de5f258c8af9ef450c13faf3f137508cd9b965da authored by Douglas Bates on 12 June 2004, 00:00:00 UTC, committed by Gabor Csardi on 12 June 2004, 00:00:00 UTC
1 parent c545398
cscMatrix-class.Rd
\name{cscMatrix-class}
\docType{class}
\alias{cscMatrix-class}
\alias{coerce,matrix,cscMatrix-method}
\alias{coerce,cscMatrix,tripletMatrix-method}
\alias{coerce,cscMatrix,matrix-method}
\alias{coerce,cscMatrix,geMatrix-method}
\alias{crossprod,cscMatrix,missing-method}
\alias{crossprod,cscMatrix,matrix-method}
\alias{crossprod,cscMatrix,numeric-method}
\alias{diag,cscMatrix-method}
\alias{dim,cscMatrix-method}
\alias{image,cscMatrix-method}
\alias{t,cscMatrix-method}
\title{Class "cscMatrix" compressed, sparse, column Matrix}
\description{The \code{cscMatrix} class is a class of sparse matrices in
the compressed, sparse, column-oriented format. In this
implementation the non-zero elements in the columns are sorted into
increasing row order.}
\section{Objects from the Class}{
Objects can be created by calls of the form \code{new("cscMatrix", ...)}.
}
\section{Slots}{
\describe{
\item{\code{p}:}{Object of class \code{"integer"} of pointers, one
for each column, to the initial (zero-based) index of elements in
the column.}
\item{\code{i}:}{Object of class \code{"integer"} of length nnzero
(number of non-zero elements). These are the row numbers for
each non-zero element in the matrix.}
\item{\code{x}:}{Object of class \code{"numeric"} - the non-zero
elements of the matrix.}
\item{\code{nrow}:}{Object of class \code{"integer"} - the number of
rows in the matrix.}
}
}
\section{Methods}{
\describe{
\item{coerce}{\code{signature(from = "matrix", to = "cscMatrix")}}
\item{coerce}{\code{signature(from = "cscMatrix", to = "matrix")}}
\item{coerce}{\code{signature(from = "cscMatrix", to = "tripletMatrix")}}
\item{crossprod}{\code{signature(x = "cscMatrix", y = "missing")}
returns \code{t(x) \%*\% x} as an \code{sscMatrix} object.}
\item{crossprod}{\code{signature(x = "cscMatrix", y = "matrix")}: ... }
\item{crossprod}{\code{signature(x = "cscMatrix", y = "numeric")}: ... }
\item{diag}{\code{signature(x = "cscMatrix")}: returns the diagonal
of \code{x}}
\item{dim}{\code{signature(x = "cscMatrix")}: returns the dimensions
of \code{x}}
\item{image}{\code{signature(x = "cscMatrix")}: plots an image of
\code{x} using the \code{\link[lattice]{levelplot}} function}
}
}
%\references{}
%\author{}
%\note{}
\seealso{
\code{\link{sscMatrix-class}}, \code{\link{tscMatrix-class}}
}
%\examples{}
\keyword{classes}
\keyword{algebra}
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