I'm working with genotype data in a frequency table:
> a=matrix(1:16, nrow=4)
> rownames(a)=c("AA","AT","TA","TT")
> a
[,1] [,2] [,3] [,4]
AA 1 5 9 13
AT 2 6 10 14
TA 3 7 11 15
TT 4 8 12 16
'AT' and 'TA' are essentially the same, and I'd like to combine (add) the rows
to reflect this. The final matrix should be:
[,1] [,2] [,3] [,4]
AA 1 5 9 13
AT 5 13 21 29
TT 4 8 12 16
Is there a fast way to do this?
Thanks in advance!
Jacy Crosby
jacy.r.cro...@uth.tmc.edu
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