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  analysis in the same file that also produces the report.
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  analysis in the same file that also produces the report.
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  \code{Sweave} combines the documentation and code chunks (or
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  \code{Sweave} combines the documentation and code chunks (or
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  their output) into a single document.  \code{Stangle} extracts only
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  their output) into a single document.  \code{Stangle} extracts only
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  the code from the Sweave file creating an \R source file that can be
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  the code from the Sweave file creating an \R source file that can be
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  run using \code{\link{source}}.  (Code inside \code{\\Sexpr\{\}}
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  run using \code{\link{source}}.  (Code inside \verb{\Sexpr{}}
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  statements is ignored by \code{Stangle}.)
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  statements is ignored by \code{Stangle}.)
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  \code{Stangle} is just a wrapper to \code{Sweave} specifying a
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  \code{Stangle} is just a wrapper to \code{Sweave} specifying a
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  different default driver.  Alternative drivers can be used and are
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  different default driver.  Alternative drivers can be used and are
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  provided by various contributed packages.
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  provided by various contributed packages.
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  objects are consulted in turn, and selected if their \code{extension}
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  objects are consulted in turn, and selected if their \code{extension}
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  component matches (as a regexp) the file name.  Objects
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  component matches (as a regexp) the file name.  Objects
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  \code{SweaveSyntaxNoweb} (with \code{extension = "[.][rsRS]nw$"}) and
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  \code{SweaveSyntaxNoweb} (with \code{extension = "[.][rsRS]nw$"}) and
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  \code{SweaveSyntaxLatex} (with \code{extension = "[.][rsRS]tex$"}) are
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  \code{SweaveSyntaxLatex} (with \code{extension = "[.][rsRS]tex$"}) are
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  supplied, but users or packages can supply others with names matching
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  supplied, but users or packages can supply others with names matching
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  the pattern \code{SweaveSyntax.*}.
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  the pattern \samp{SweaveSyntax.*}.
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}
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}
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\author{
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\author{
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  Friedrich Leisch and R-core.
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  Friedrich Leisch and R-core.
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}
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}