[Rd] Sweave <<*, showWarnings=TRUE>> ?

[Martin Maechler]

Thank you Duncan, for expanding Sweave functionality,
notably considering error handling.

Related to that is the topic of handling warning messages.

In a course on "using R" (for beginners),
I would really like to show warnings that code chunks produce.
Currently, the warnings are printed to the console when I run
 'R CMD Sweave ..' and do not appear in the resulting *.tex file.

Of course   ---   fortune("Yoda")   ---
I can always fudge what I want,
but it would be quite desirable to have simple Sweave option
which would deal with warnings()  
{ and maybe message(), stop(), and general exception handling; 
  but for all practical purposes, it's the warnings that I'd
  like to be handled automatically.}

Martin Maechler, ETH Zurich