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\name{sparseMatrix-class}
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\name{sparseMatrix-class}
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\docType{class}
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\docType{class}
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\alias{sparseMatrix-class}
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\alias{sparseMatrix-class}
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\alias{show,sparseMatrix-method}
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\alias{show,sparseMatrix-method}
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\alias{\%*\%,sparseMatrix,ddenseMatrix-method}
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\alias{\%*\%,ddenseMatrix,sparseMatrix-method}
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\alias{crossprod,sparseMatrix,ddenseMatrix-method}
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\alias{crossprod,ddenseMatrix,sparseMatrix-method}
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\title{Virtual Class "sparseMatrix" --- Mother of Sparse Matrices}
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\title{Virtual Class "sparseMatrix" --- Mother of Sparse Matrices}
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\description{Virtual Mother Class of All Sparse Matrices}
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\description{Virtual Mother Class of All Sparse Matrices}
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\section{Slots}{
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\section{Slots}{
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  \code{Dim}, and \code{Dimnames}, see \code{\link{Matrix-class}}.
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  \code{Dim}, and \code{Dimnames}, see \code{\link{Matrix-class}}.
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}
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}
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    \item{show}{\code{signature(object = "sparseMatrix")}: The
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    \item{show}{\code{signature(object = "sparseMatrix")}: The
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      \code{\link{show}} method for sparse matrices prints
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      \code{\link{show}} method for sparse matrices prints
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      \emph{\dQuote{structural}} zeroes as \code{"."} or blank.}
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      \emph{\dQuote{structural}} zeroes as \code{"."} or blank.}
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  }
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  }
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}
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}
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\note{
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  In method selection for multiplication operations (i.e. \code{\%*\%}
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  and the two-argument form of \code{\link[base]{crossprod}})
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  the sparseMatrix class takes precedence in the sense that if one
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  operand is a sparse matrix and the other is any type of dense matrix
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  then the dense matrix is coerced to a \code{dgeMatrix} and the
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  appropriate sparse matrix method is used.
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}
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%\author{Martin}
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%\author{Martin}
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\examples{
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\examples{
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showClass("sparseMatrix") ## and look at the help() of its subclasses
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showClass("sparseMatrix") ## and look at the help() of its subclasses
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}
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}
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\keyword{classes}
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\keyword{classes}