Friends

I am starting on a (section of the) project where I need to build a matrix
with on the order of 5 million rows and 200 columns

I am wondering if I can stay in R.

I need to do rollapply type operations on the columns, including some that
will be functions of (windows of) two columns.

I have been looking at the ff and bigmemory packages but am not sure that
they will do.

Before I get too deep can some one offer some wisdom about what the best
direction to go would be?

Switching to C/C++ is definitely an option if it is all too hard

cheers
Worik

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