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Displaying errors with sweave

I'm writing some R notes with Sweave and would like to show common errors. For example, 

<<echo=TRUE, eval=TRUE>>=
x = 5
#Case matters!
x*X
@

However when sweaving, the document won't compile due to the R error. Is there any way to make sweave compile and show the (nicely formated) error?

Solution

  • As Shane suggests, use 

    <<echo=TRUE,eval=FALSE>>

    for the code that will error, but you want to display, and then again with 

    <<echo=FALSE,eval=TRUE,results=verbatim>>

    but with the same code wrapped in a try.

    There's an example here: http://tolstoy.newcastle.edu.au/R/help/05/09/11690.html