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2008 Mar 15
0
Appending new values to an existing factor vector
Hello, I've recently come across a situation where I'm trying to read in [genotype data] files that have around 80,000,000 lines, 4 fields, with a high proportion of repeated strings, here's a sample: rsXXXXXXX SAMPLE0001 CG 0.05302 rsXXXXXX SAMPLE0001 CC 0.06817 rsXXXXXXXX SAMPLE0001 CC 0.01369 rsXXXXXXY SAMPLE0001 GG 0.01816 rsXXXXXXZ SAMPLE0001 GG 0.006711 rsXXXXXXX SAMPLE0002 GG 0.05813 [For the purpose of the work I'm...