\name{rootedDAG-class}
\docType{class}
\alias{rootedDAG-class}
\alias{DAG}
\alias{root}
\alias{getMatrix,rootedDAG,character,character-method}
\alias{DAG,rootedDAG-method}
\alias{root,rootedDAG-method}
\title{Class "rootedDAG" }
\description{wraps a graph that can be 
shown to be a DAG and has a root (one node with no ancestor) }
\section{Objects from the Class}{
Objects can be created by calls of the form \code{new("rootedDAG", ...)}.
Does not extend graph but probably should.
}
\section{Slots}{
  \describe{
    \item{\code{root}:}{Object of class \code{"character"} name of root }
    \item{\code{DAG}:}{Object of class \code{"graph"} DAG }
  }
}
\section{Methods}{
  \describe{
    \item{DAG}{\code{signature(x = "rootedDAG")}: extract the graph }
    \item{getMatrix}{\code{signature(g = "rootedDAG", type = "character", mode = "character")}: Currently only 'child2parent' can be used
for type, meaning that row corresponds to child,
column corresponds to ancestor and mat[row,column] is 1
if node corresponding to row is a child of node corresponding to ancestor. 
Type can be 'sparse' (return sparse representation)
or 'dense'.}
    \item{root}{\code{signature(x = "rootedDAG")}: extract name of root }
  }
}
%\references{ ~put references to the literature/web site here ~ }
\author{ VJ Carey <stvjc@channing.harvard.edu> }
%\note{ ~~further notes~~ }

% ~Make other sections like Warning with \section{Warning }{....} ~

%\seealso{
%  ~~objects to See Also as \code{\link{~~fun~~}}, ~~~
%  or \code{\link{CLASSNAME-class}} for links to other classes
%}
\examples{
}
\keyword{classes}