[R] Question about Sweave

[Roger Bivand]

On Mon, 27 Feb 2006, Elizabeth Purdom wrote:

> Hi,
> 
> I'm not sure if Sweave questions should go to the general list, but it 
> seems to be part of the core R package without a separate maintainer.
> 
> I am writing a tutorial for R in a latex file. I'd like to use Sweave, 
> since this seems its ideal usage. The problem is that I want to 
> purposefully put errors in and then the output that comes with it in the 
> text of my tutorial. However the errors kill the function Sweave() in R 
> when what I would like is for Sweave to just run it and include the error 
> message as part of the output.
> 
> I have set options(error=NULL). It doesn't seem that the error options 
> would affect Sweave in the right way, since an error in my .Rnw file causes 
> an error in Sweave() itself, not just in the processing of the code, but 
> maybe there's an error-handling system I don't know about that would do it. 
> (I tried error=expression(NULL) but Sweave couldn't finish regardless). I 
> don't see any options in the documentation of Sweave that allow this 
> behavior, either.

The usual way is to put the erroneous command inside try(), and mix blocks 
with echo=FALSE or TRUE and cat() of the object returned by try() of your 
command. See:

http://finzi.psych.upenn.edu/R/Rhelp02a/archive/60984.html

for an example.

> 
> Thanks,
> Elizabeth
> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no