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Rev 70260 Rev 70779
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  makes R run a little more slowly even when no objects are being
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  makes R run a little more slowly even when no objects are being
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  traced.  \code{tracemem} and \code{untracemem} give errors when R is not
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  traced.  \code{tracemem} and \code{untracemem} give errors when R is not
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  compiled with memory profiling; \code{retracemem} does not (so it can be
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  compiled with memory profiling; \code{retracemem} does not (so it can be
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  left in code during development).
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  left in code during development).
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  It is enabled in the CRAN OS X and Windows builds of \R.
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  It is enabled in the CRAN macOS and Windows builds of \R.
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  When an object is traced any copying of the object by the C function
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  When an object is traced any copying of the object by the C function
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  \code{duplicate} produces a message to standard output, as does type
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  \code{duplicate} produces a message to standard output, as does type
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  coercion and copying when passing arguments to \code{.C} or
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  coercion and copying when passing arguments to \code{.C} or
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  \code{.Fortran}.
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  \code{.Fortran}.