R help - Jun 2009 - last.warning and Sweave?

Sweave does something clever with warnings, which I have so far been
unable to figure out.  There are a couple of threads on the list about
this, but the best in here is a hack to redirect all the output and
stick it back in.

http://www.nabble.com/-R--Sweave-and-warning-messages-td7759353.html#a7759353
http://www.nabble.com/two-questions-on-Sweave-(help-in-the-output-%2B-warnings-in-the-output)-td19579172.html#a19579172

  I thought I could get around this with last.warning , but apparently
that doesn't work -- this file doesn't produce the desired output of
reproducing the last warning ...

  any thoughts?

  Ben Bolker

=======================\documentclass{article}

Test {\tt last.warning}

<<>>x <- log(-1)
L <- last.warning
@

<<>>L
@

\end{document}
=================
-- 
Ben Bolker
Associate professor, Biology Dep't, Univ. of Florida
bolker at ufl.edu / www.zoology.ufl.edu/bolker
GPG key: www.zoology.ufl.edu/bolker/benbolker-publickey.asc

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Ben Bolker <bolker <at> ufl.edu> writes:
>   Sweave does something clever with warnings, which I have so far been
...
>   I thought I could get around this with last.warning , but apparently
> that doesn't work -- this file doesn't produce the desired output
of
> reproducing the last warning ...
> 
> =======================> \documentclass{article}
Missing \begin{document}
 
> Test {\tt last.warning}
> 
> <<>>> x <- log(-1)
> L <- last.warning
> @
> 
> <<>>> L
> @
> 
> \end{document}
> =================
No real answer, but I inserted a 

print(exits("last.warning")) 

which gives FALSE when sweaved, but TRUE when the tangled R file is run.


Dieter