r - Is there a way to define all Sweave options in code? -

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quoting pgfsweave manual:

how set subdirectories gures , caches? straight out of sweave , cachesweave manuals (nothing new here). figures subdirectory use prefix.string option:

\sweaveopts{prefix.string=figs/fig}

for caching subdirectory use code chunk @ beginning or document like:

<<setup,echo=f>>= setcachedir("cache") @

i find annoying 2 options in different places, r code vs. latex directive. there way set prefix.string option r code, perhaps before sweave called?

sweave options can set globally either using \sweaveopts or in call sweave, this:

sweave("tmp.rnw", prefix.string="figs/figs")

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