[R] Contacting a Wiki Author

[Farrel Buchinsky]

How do I contact a Wiki author?
for instance I was referring to tips:data-frames:generate_index_vectors and 
encountered an error when I input
ChickWeight$indexchick <- rep(1:(length(newchick)-1),
                              diff(newchick))
Error in "$<-.data.frame"(`*tmp*`, "indexchick", value = c(1, 1, 1, 1,  :
        replacement has 566 rows, data has 578

I can see that the author of the page is derwisch

But how does one e-mail derwisch? Does the wiki have a way of contacting a 
user?

-- 
Farrel Buchinsky, MD
Pediatric Otolaryngologist
Allegheny General Hospital
Pittsburgh, PA