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View of /pkg/man/sparseMatrix-class.Rd

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Revision 1290 - (download) (as text) (annotate)
Thu Jun 8 09:30:21 2006 UTC (13 years, 3 months ago) by maechler
File size: 1948 byte(s)
implemented all 4 of {rowSums(), ... colMeans()}
\title{Virtual Class "sparseMatrix" --- Mother of Sparse Matrices}
% graph stuff
\description{Virtual Mother Class of All Sparse Matrices}
    \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}:}{a list of length two - inherited from class
      \code{Matrix}, see \code{\linkS4class{Matrix}}.}
    \item{\code{factors}:}{Object of class \code{"list"} - a list
      of factorizations of the matrix. }
  Class \code{"Matrix"}, directly.
    \item{show}{\code{signature(object = "sparseMatrix")}: The
      \code{\link{show}} method for sparse matrices prints
      \emph{\dQuote{structural}} zeroes as \code{"."} or blank.}
  In method selection for multiplication operations (i.e. \code{\%*\%}
  and the two-argument form of \code{\link[base]{crossprod}})
  the sparseMatrix class takes precedence in the sense that if one
  operand is a sparse matrix and the other is any type of dense matrix
  then the dense matrix is coerced to a \code{dgeMatrix} and the
  appropriate sparse matrix method is used.
showClass("sparseMatrix") ## and look at the help() of its subclasses
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