Marc, >I have a large .Rnw file and was in the process of doing some debugging. >I had set some R chunks to 'eval=false' in the process. This resulted in >some R objects not being created that were in turn used in the >subsequent \Sexpr's.
I have often the same problem, I'm using a construct like : <<eval=F>>= x <- rnorm(100) @ I have \Sexpr{ifelse(exists("x"), length(x), "???")} elements in vector x. This works well for me, and you have more control than a global \SweaveOpts{eval.Sexpr=false} would allow, for instance : <<TimeConsumingCodeChunk1,eval=F>>= x <- rnorm(100) ... @ I have \Sexpr{ifelse(exists("x"), length(x), "Ooops, I forgot to evaluate TimeConsumingCodeChunk1")} elements in vector x. Wouldn't it be enough to mention this in Sweave's FAQ ? Best, Jean -- Jean R. Lobry ([EMAIL PROTECTED]) Laboratoire BBE-CNRS-UMR-5558, Univ. C. Bernard - LYON I, 43 Bd 11/11/1918, F-69622 VILLEURBANNE CEDEX, FRANCE allo : +33 472 43 27 56 fax : +33 472 43 13 88 http://pbil.univ-lyon1.fr/members/lobry/ ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel