[R] Contacting a Wiki Author

Farrel Buchinsky fjbuch at gmail.com
Sat Sep 9 18:34:45 CEST 2006

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$indexchick <- rep(1:(length(newchick)-1),
Error in "$<-.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 

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

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