\name{write.nexus}
\alias{write.nexus}
\title{Write Tree File in Nexus Format}
\usage{
write.nexus(phy, file = "", translate = TRUE, original.data = TRUE)
}
\arguments{
  \item{phy}{an object of class \code{"phylo"}.}
  \item{file}{a file name specified by either a variable of mode character,
    or a double-quoted string; if \code{file = ""}(the default) then the
    tree is written on the standard output connection.}
  \item{translate}{a logical, if \code{TRUE} (the default) a translation
    of the tip labels is done which are replaced in the parenthetic
    representation with tokens.}
  \item{original.data}{a logical, if \code{TRUE} (the default) the
    data in the original NEXUS file are eventually written in
    \code{"file"} (see below).}
}
\description{
  This function writes a tree in a file with the NEXUS format.
}
\details{
  If \code{original.data = TRUE}, the file as specified by the attribute
  \code{"origin"} of \code{phy} is read and its data (except the trees)
  are written in \code{file}.

  Currently, only a single tree can be written in \code{file}.
}
\value{
  None (invisible `NULL').
}
\references{
  Maddison, D. R., Swofford, D. L. and Maddison, W. P. (1997) NEXUS: an
  extensible file format for systemaric information. \emph{Systematic
    Biology}, \bold{46}, 590--621.
}

\author{Emmanuel Paradis \email{paradis@isem.univ-montp2.fr}}
\seealso{
  \code{\link{read.nexus}}, \code{\link{read.tree}},
  \code{\link{write.tree}}

}
\keyword{manip}
\keyword{IO}