Thanks for your R help, posted at
https://stat.ethz.ch/pipermail/r-help/2008-November/179050.html

I also found this very helpful at
http://stackoverflow.com/questions/11105234/filtering-out-rows-in-a-matrix-containing-only-0-in-r:
Filtering out rows in a matrix containing only 0 in
R<http://stackoverflow.com/questions/11105234/filtering-out-rows-in-a-matrix-containing-only-0-in-r>

Maybe not relevant or you likely have already been through it, but I found
this 16 1/2 hr audiobook to be quite worthwhile:  *Antifragile: Things That
Gain from Disorder,* by Nassim Nicholas TALEB.
Wikipedia Bio: http://en.wikipedia.org/wiki/Nassim_Nicholas_Taleb
Book Review:
http://continuations.com/post/51065634453/antifragile-by-nassim-taleb-book-review.
Also amazed by the huge bibliography.
Also, *Antifragile by Nassim Taleb: review at:
http://www.telegraph.co.uk/culture/books/bookreviews/9711211/Antifragile-by-Nassim-Taleb-review.html
.*
**
Thanks for taking the time to  explain  this feature of R.

Bruce Petrovics
Math Hobbyist, age 67

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