[R] sparse data frame (crsp?)

ivo_welch-rstat8303@mailblocks.com ivo_welch-rstat8303 at mailblocks.com
Mon Jul 25 03:14:05 CEST 2005

dear R wizards:  does R have the facilities to handle sparse data 
frames?  I am thinking of reading a data base like the daily CRSP data 
into R, observations being firms, columns being days, data being stock 
returns.  but this will only fit into my memory if I can convince R to 
not have to store missing observations, and to return NA upon read 
access to missing observations.  pointers appreciated.  sincerely,  /iaw

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