[R] Re move specific rows from a matrix

[mentor_]

Hi,

imagine the following two matrix:
Matrix A:
a b c
1 2 3
4 5 6
7 8 9

Matrix B:
a
4
7

I would like to remove those rows from matrix A which are present in both
matrices.
So after removing the corresponding rows the matrix A should look like this:
Matrix A:
a b c
1 2 3

Thanks in advance!
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