I have a code junk that produces a figure. In my special case, however, data does not always exist. In cases where data exists, the code chunk is of course trival (case #1), however, what do I do for case # 2 where the data does not exist? I can obviously prevent the code from being executed by checking the existence of the object x, but on the Sweave level I have a static figure chunk. Here an example that should be reproducible:
# case 1 x <- c(1,2,3) # case 2 - no definition of variable #x <- c(1,2,3) <<echo=FALSE, results=hide, fig=TRUE>>= if(exists(as.character(substitute(meta.summary)))){ plot(x) } @ In a way I would need a conditional chunk or a chunk that draws a figure only if it was generated and ignores it otherwise. Any ideas? Ralf ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.