[R] How to build a matrix of number of appearance?

UriB uriblass at gmail.com
Tue Jul 5 11:45:05 CEST 2011

Thanks for your reply
Note that I guess that there are many providerID and I get the error cannot
allocate vector of size 2.1 Gb
(I can use the same trick for most of the other fields)

Is there a way to do the same only for providerID with relatively high

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