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...columns by tens of thousands of rows; 20 MB) is text file (tab delimited). Output file: abc sdf xyz 111 1 1 1 1079 1 0 2 5576 1 2 0 Or, other ways to generate this data so I can then use it for heat map creation? Thanks for any help you may have, rtsweeney palo alto, ca -- View this message in context: http://r.789695.n4.nabble.com/frequency-count-rows-data-for-heat-map-tp2338363p2338363.html Sent from the R help mailing list archive at Nabble.com.