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Hi, several image file format supports textual/meta data comments in one way or the other. For me an obvious usage would be to add sessionInfo() information to PNG and PDF image files, ideally from within R although external tools would work as well(*). Has anyone looked into this or have any suggestions or comments? /Henrik (*) One could even imagine including self-contained R

Hello R experts, I plan to develop a tool for dynamic analysis of R programs. I would like to trace function calls at runtime, capturing argument and return values. Following a suggestion made some time ago on this list, my high-level implementation strategy is to rewrite the AST, augmenting call expressions with pre-call and post-call shims to capture the arguments and return value,