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  \item{method}{
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  \item{method}{
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    Download method, see \code{\link{download.file}}.
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    Download method, see \code{\link{download.file}}.
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  }
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  }
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  \item{type}{
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  \item{type}{
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    character string, indicate which type of packages: see
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    character string, indicate which type of packages: see
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    \code{\link{install.packages}}.
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    \code{\link{install.packages}} and \sQuote{Details}.
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  }
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  }
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  \item{\dots}{
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  \item{\dots}{
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    additional arguments to be passed to \code{\link{download.file}}
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    additional arguments to be passed to \code{\link{download.file}}
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    and \code{\link{available.packages}}.
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    and \code{\link{available.packages}}.
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  }
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  }
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  i.e.\sspace{}the URL starts with \code{"file:"}, then the packages are not
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  i.e.\sspace{}the URL starts with \code{"file:"}, then the packages are not
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  downloaded but used directly.  Both \code{"file:"} and
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  downloaded but used directly.  Both \code{"file:"} and
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  \code{"file:///"} are allowed as prefixes to a file path.  Use the
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  \code{"file:///"} are allowed as prefixes to a file path.  Use the
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  latter only for URLs: see \code{\link{url}} for their interpretation.
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  latter only for URLs: see \code{\link{url}} for their interpretation.
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  (Other forms of \samp{file://} URLs are not supported.)
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  (Other forms of \samp{file://} URLs are not supported.)
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  For \code{download.packages}, \code{type = "both"} looks at source
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  packages only.
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}
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}
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\value{
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\value{
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  A two-column matrix of names and destination file names of those
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  A two-column matrix of names and destination file names of those
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  packages successfully downloaded.  If packages are not available or
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  packages successfully downloaded.  If packages are not available or
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  there is a problem with the download, suitable warnings are given.
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  there is a problem with the download, suitable warnings are given.