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Alex Rivera
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Is there a fast way of finding which rows in matrix A are present in matrix B? e.g. m1 = matrix(c(1:6), ncol=2, byrow = T); m2 = matrix(c(1:4), ncol=2, byrow=T); and the result would be 1, 2. The matrices do not have the same number of rows (number of columns is the same), and they are somewhat big - from 10^6 - 10^7 number of rows. The fastest way of doing it, that I know of for now, is: duplicated(rbind(m1, m2)) Tnx!
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