I have 2 matrices. One which contains a complete set of row combinations.
Another which contains a subset of the first. What I would like to extract
is the rows which are in the first but not repeated in the second. For
instance if the following were my two matrices,
A
[,1] [,2] [,3] [,4]
[1,] 1 2 3 4
[2,] 1 2 3 5
[3,] 1 2 3 6
[4,] 1 2 3 7
[5,] 1 2 3 8
[6,] 1 2 3 9
B
[,1] [,2] [,3] [,4]
[1,] 1 2 3 4
[2,] 1 2 3 5
[3,] 1 2 3 6
[4,] 1 2 3 9
I would like to extract the following,
[,1] [,2] [,3] [,4]
[1,] 1 2 3 7
[2,] 1 2 3 8
I would like to know if there is a simple solution to this problem? If I
added the matrices and used the unique function, could I track which rows
have been deleted? Otherwise, I can only think of performing a loop with an
if statement.
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