Question

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?

Answer 1

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