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  internal \R objects, passing the arguments to the code as a sequence
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  internal \R objects, passing the arguments to the code as a sequence
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  of \R objects.  They assume C calling conventions, so can usually
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  of \R objects.  They assume C calling conventions, so can usually
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  also be used of C++ code.
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  also be used of C++ code.
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  For details about how to write code to use with these functions see
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  For details about how to write code to use with these functions see
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  the chapter on \dQuote{System and foreign language interfaces} in
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  the chapter on \sQuote{System and foreign language interfaces} in
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  the \dQuote{Writing \R Extensions} manual.  They differ in the way the
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  the \sQuote{Writing \R Extensions} manual.  They differ in the way the
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  arguments are passed to the C code:  \code{.External} allows for a
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  arguments are passed to the C code:  \code{.External} allows for a
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  variable number of arguments.
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  variable number of arguments.
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  These functions are \link{primitive}, and \code{.NAME} is always
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  These functions are \link{primitive}, and \code{.NAME} is always
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  matched to the first argument supplied (which should not be named).
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  matched to the first argument supplied (which should not be named).