This sort of question is ideal to send directly to the maintainer.

We've removed kmeans.big.matrix for the time being and will place it in a
new package, bigmemoryAnalytics.  bigmemory itself is the core building
block and tool, and we don't want to pollute it with lots of extras.

Allan's point is right: big data packages (like bigmemory and ff) can't
be used directly with R functions (like lm).  And because of R's design you
can't extract subsets with more than 2^31-1 elements, even though the
big.matrix can be as large as you need (with filebacking).

I hope that helps.

Jay

-- 
John W. Emerson (Jay)
Associate Professor of Statistics
Department of Statistics
Yale University
http://www.stat.yale.edu/~jay

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