This StackOverflow post: https://stackoverflow.com/q/69756236/2554330
points out that objects created in one vignette are available in a later
vignette. I don't think this should be happening: vignettes should be
self-contained.
The current answer there, https://stackoverflow.com/a/69758025/2554330,
suggests that "R CMD check" will detect this. However, sometimes one
vignette can replace a standard function with a custom version, and then
both will work without generating an error, but the second vignette
won't do the same thing if run independently.
For example, try these pure Sweave vignettes:
-------------------------
aaa3.Rnw:
-------------------------
\documentclass{article}
%\VignetteIndexEntry{Sweave aaa3}
\begin{document}
<<>>=
mean <- function(x) "I am the Sweave mean"
@
\end{document}
------------------------
aaa4.Rnw:
------------------------
\documentclass{article}
%\VignetteIndexEntry{Sweave aaa4}
\begin{document}
<<>>=
mean(1:5)
@
\end{document}
Put these in a package, build and install the package, and you'll see
that the mean() function in aaa4.Rnw prints the result from the
redefined mean in aaa3.Rnw.
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