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If you ever try to communicate with someone about an error you are having with R, then you should include your session information in the message. Here is how to do that, and below is what the output looks like.
sessionInfo()
input = knitr::current_input() # filename of input document output = paste(tools::file_path_sans_ext(input), 'R', sep = '.') knitr::purl(input,output,documentation=1,quiet=TRUE)
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