\name{matrixIndex-class}
\docType{class}
\alias{matrixIndex-class}
\alias{[,matrixIndex,ANY,ANY,ANY-method}
\alias{[[,matrixIndex,numeric,missing-method}
\alias{allNA,matrixIndex-method}
\alias{anyNA,matrixIndex-method}
\alias{coerce,matrixIndex,vectorIndex-method}
\alias{dim,matrixIndex-method}
\alias{dimnames,matrixIndex-method}
\alias{length,matrixIndex-method}
\alias{names,matrixIndex-method}
\alias{setDimNames,matrixIndex-method}
\alias{setNames,matrixIndex-method}

\title{Class "matrixIndex", index class representing a set of row and
  column subscripts for a matrix }
\description{ Objects of class \code{"matrixIndex"} represent subscripts
  corresponding to a submatrix of some matrix of a given size. Like the
  \code{"vectorIndex"} subclasses, this is a class for internal use. }
\section{Objects from the Class}{
Objects can be created by calls of the form \code{new("matrixIndex",
  row, col, origdim, Names)}.
}
\section{Slots}{
  \describe{
    \item{\code{row}:}{Object of class \code{"vectorIndex"}, the row
      subscript. }
    \item{\code{col}:}{Object of class \code{"vectorIndex"}, the column
      subscript. }
    \item{\code{origdim}:}{Object of class \code{"integer"}, the
      dimension of the full matrix. }
    \item{\code{Names}:}{Object of class \code{"vectorNamesType"}, names
      for the submatrix elements when the submatrix is treated as
      vectors. }
  }
}
\section{Extends}{
Class \code{"externalVector"}, directly.
}
\section{Methods}{
  Signature components for the methods are:

  \tabular{ll}{
    x \tab The class "allIndex"\cr
    scalar \tab Length one positive "integer"\cr
    i \tab The class "ANY"\cr
    j \tab The class "ANY"\cr
    drop \tab The class "logical"\cr
    value \tab The class "ANY"\cr
    .Object \tab The class "allIndex"\cr
  }

  \describe{
    \item{x[i, j, drop=FALSE]}{ Create another object of cloass
      \code{matrixIndex} with same \code{origdims} represents a further
      submatrix of the full matrix. If \code{drop} is \code{TRUE} and at
      least one of the dimensions of the answer is \code{1}, the answer
      is an object of class \code{"vectorIndex"} instead. }
    \item{x[[i]]}{ Get the subscript representing the indices for
      dimension \code{i}. }
    \item{dim(x)}{ Get the dimension of \code{x}. }
    \item{dimnames(x)}{ Get the dimnames of \code{x}. }
    \item{length(x)}{ Get the length of \code{x} considered as a
      vector. This is same as \code{prod(dim(x))}. }
    \item{names(x)}{ Get the names of \code{x}. }
    \item{setDimNames(x, value)}{ Set the dimnames of \code{x} and
      return the modified \code{x}. }
    \item{setNames(x, value)}{ Set the names of \code{x} and return the
      modified \code{x}. }
    \item{as(x, "vectorIndex")}{ Coerce x to an object of class
      "vectorIndex". }
  }
}
\seealso{
  \code{\link{vectorIndex-class}} for the class of row and column subscripts.
}
\keyword{classes}