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dsym
2010 Jan 25
1
summing a large, partitioned data frame
Dear R community,
I'm trying to develop a fast way of summing specific rows of a large data frame.
Here is an example of the kind of data frames I'm dealing with:
> refls
H K L M/ISYM BATCH I SIGI
43247 1 0 5 21 79 61.44117 2.20553
1040 1 0 5 257 6 15.16316 0.54431
2324 1 0 5 257 5 46.76152 1.67858
31515 1 0 5 259 60 57.97305 2.08104
35158 1 0 5 259 61 3.15614 0.11329
51575 1 0 6 259 88 380.04477 8.08878
518...