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8004
2012 Feb 21
1
tapply for enormous (>2^31 row) matrices
Hi all,
SETUP:
I have pairwise data on 22 chromosomes. Data matrix X for a given
chromosome looks like this:
1 13 58 1.12
6 142 56 1.11
18 307 64 3.13
22 320 58 0.72
Where column 1 is person ID 1, column 2 is person ID 2, column 3 can
be ignored, and column 4 is how much chromosomal sharing those two
individuals have in some small portion of the chromosome. There are
9000 individual people, and