Bill, what will be the fastest way to output not just single lines but small data frames of about 60 rows? I prefer writing to a text file because the final output is large 47k times 60 rows and since I do not know the size of it I have to use rbind to build the object which creates the memory problems described here: http://www.matthewckeller.com/html/memory.html look at the swiss cheese paragraph. kind regards Stephen
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