what's a fast way to match two matrices (one and two) together and to extract the index of matrix two for the matches. Matrix two is large (hundreds to thousands of rows).
one
[,1] [,2]
9 11
13 2
head(two)
[,1][,2]
[1,] 9 11
[2,] 11 9
[3,] 2 3
[4,] 13 2
[5,] 2 4
[6,] 3 3
The output should be (notice how index 2 is not an output value)
1 4