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

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Wed Feb 2 15:01:50 2005 UTC (14 years, 7 months ago) by bates
File size: 2180 byte(s)
Renaming and reorganizing classes
\title{Class "dgTMatrix" sparse matrices in triplet form}
\description{The \code{"dgTMatrix"} class is the class of sparse
  matrices stored as (possibly redundant) triplets.}
\section{Objects from the Class}{
Objects can be created by calls of the form \code{new("dgTMatrix", ...)}.
    \item{\code{i}:}{Object of class \code{"integer"} - the row indices
      of non-zero entries.}
    \item{\code{j}:}{Object of class \code{"integer"} - the column
      indices of non-zero entries.  Must be the same length as slot \code{i}.}
    \item{\code{x}:}{Object of class \code{"numeric"} - the (non-zero)
      entry at position \code{(i,j)}.  Must be the same length as slot
      \code{i}. If an index pair occurs more than once the corresponding
      values of slot \code{x} are added to form the element of the matrix.}
    \item{\code{Dim}:}{Object of class \code{"integer"} of length 2 -
      the dimensions of the matrix.}
    \item{+}{\code{signature(e1 = "dgTMatrix", e2 = "dgTMatrix")}}
    \item{coerce}{\code{signature(from = "dgTMatrix", to = "dgCMatrix")}}
    \item{coerce}{\code{signature(from = "dgTMatrix", to = "dgeMatrix")}}
    \item{coerce}{\code{signature(from = "dgTMatrix", to = "matrix")}}
    \item{coerce}{\code{signature(from = "dgTMatrix", to = "dsCMatrix")}}
    \item{image}{\code{signature(x = "dgTMatrix")}: plots an image of
      \code{x} using the \code{\link[lattice]{levelplot}} function}
    \item{t}{\code{signature(x = "dgTMatrix")}: returns the transpose of
\note{Triplet matrices are a convenient form in which to construct sparse
  matrices after which they can be coerced to \code{dgCMatrix} objects.}
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