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rowmatch(v1, v2, nomatch = NA)
v1 <- data.frame(A=c(1,2,3),B=c(2,3,3),C=c(3,3,2),D=c(1,1,1)) v2 <- data.frame(A=3,B=3,C=2,D=1) rowmatch(v1,v2,nomatch=NA)
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