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% This file is part of the 'foreign' package for R
% It is distributed under the GPL version 2 or later
\name{S3 read functions}
\alias{data.restore}
\alias{read.S}
\title{Read an S3 Binary or data.dump File}
\description{
Reads binary data files or \code{data.dump} files that were produced
in S version 3.
}
\usage{
data.restore(file, print = FALSE, verbose = FALSE, env = .GlobalEnv)
read.S(file)
}
\arguments{
\item{file}{the filename of the S-PLUS \code{data.dump} or binary
file.}
\item{print}{whether to print the name of each object as read from the
file.}
\item{verbose}{whether to print the name of every subitem within each
object.}
\item{env}{environment within which to create the restored object(s).}
}
\value{
For \code{read.S}, an R version of the S3 object.
For \code{data.restore}, the name of the file.
}
\details{
\code{read.S} can read the binary files produced in some older
versions of S-PLUS on either Windows (versions 3.x, 4.x, 2000) or Unix
(version 3.x with 4 byte integers). It automatically detects whether
the file was produced on a big- or little-endian machine and adapts
itself accordingly.
\code{data.restore} can read a similar range of files produced by
\code{data.dump} and for newer versions of S-PLUS, those from
\code{data.dump(....., oldStyle=TRUE)}.
Not all S3 objects can be handled in the current version. The most
frequently encountered exceptions are functions and expressions; you
will also have trouble with objects that contain model formulas. In
particular, comments will be lost from function bodies, and the
argument lists of functions will often be changed.
}
\author{
Duncan Murdoch
}
\examples{
\dontrun{read.S(file.path("_Data", "myobj"))
data.restore("dumpdata", print = TRUE)
}}
\keyword{data}
\keyword{file}
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