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  high load.
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  high load.
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  Functions will only be recorded in the profile log if they put a
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  Functions will only be recorded in the profile log if they put a
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  context on the call stack (see \code{\link{sys.calls}}).  Some
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  context on the call stack (see \code{\link{sys.calls}}).  Some
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  \link{primitive} functions do not do so: specifically those which are
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  \link{primitive} functions do not do so: specifically those which are
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  of \link{type} \code{"special"} (see the \sQuote{R Internals} manual
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  of \link{type} \code{"special"} (see \manual{R-ints}{}
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  for more details).
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  for more details).
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  Individual statements will be recorded in the profile log if
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  Individual statements will be recorded in the profile log if
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  \code{line.profiling} is \code{TRUE}, and if the code being executed
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  \code{line.profiling} is \code{TRUE}, and if the code being executed
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  was parsed with source references.  See \code{\link{parse}} for a
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  was parsed with source references.  See \code{\link{parse}} for a
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them.  If the profiler runs out of space it will skip recording the
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them.  If the profiler runs out of space it will skip recording the
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line information for new files, and issue a warning when
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line information for new files, and issue a warning when
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\code{Rprof(NULL)} is called to finish profiling.
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\code{Rprof(NULL)} is called to finish profiling.
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}
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}
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\seealso{
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\seealso{
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  The chapter on \dQuote{Tidying and profiling R code} in
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  The Chapter \manual{R-exts}{Tidying and profiling R code}.
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  \sQuote{Writing R Extensions}:
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  \code{\link{RShowDoc}("R-exts#Tidying-and-profiling-R-code")}.
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  \code{\link{summaryRprof}} to analyse the output file.
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  \code{\link{summaryRprof}} to analyse the output file.
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  \code{\link{tracemem}}, \code{\link{Rprofmem}} for other ways to track
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  \code{\link{tracemem}}, \code{\link{Rprofmem}} for other ways to track
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  memory use.
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  memory use.