In R, match function for rows or columns of matrix

Question

The value matching function in R is very useful. But from my understanding, it does not sufficiently support two or high dimensional inputs.

For examp

Answer 1

You could use apply:

z <- apply(x, 1, function(a) apply(y, 1, function(b) all(a==b)))

This will generate a matrix with nrow(x) rows and nrow(y) columns, whose entries mark the indices where there is a match.