Michael Kao <mkao006rmail <at> gmail.com> writes:
>
Well, taking a second look, I'd say it depends on the exact formulation.
In the applications I have in mind, I would like to count each occurrence
in B only once. Perhaps the OP never thought about duplicates in B
Hans Werner
>
> Here is an example based on the duplicated function
>
> test.mat1 <- matrix(1:20, nc = 5)
>
> test.mat2 <- rbind(test.mat1[sample(1:5, 2), ], matrix(101:120, nc = 5))
>
> compMat <- function(mat1, mat2){
> nr1 <- nrow(mat1)
> nr2 <- nrow(mat2)
> mat2[duplicated(rbind(mat1, mat2))[(nr1 + 1):(nr1 + nr2)], ]
> }
>
> compMat(test.mat1, test.mat2)
>
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