The .tex file on which to run latex, defaulting to the output file from Sweave
weave
The function to carry out the weaving.
...
See Details below.
Details
The ... arguments are passed to the corresponding Sweave* function.
If the Rnw argument is a filename ending in .tex, then
knitting is skipped, but the output file is still patched (because
one of the other files in the project might have come from knitr).