Given a matrix MTX of any size and an integer N, apply mirrored edges of size N to the matrix.
e.g.
MTX = [ 1 2 3
4 5 6
7 8 9];
N = 1;
OUT = [ 1 1 2 3 3
1 1 2 3 3
4 4 5 6 6
7 7 8 9 9
7 7 8 9 9];
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This is a very peculiar definition of "mirrored" edges. Value are reflected at the top but not the two sides and the bottom.
Not just peculiar but non-uniform as well. Feels more like a pattern the Author made to his liking
That's a bizarre mirror. And as others have pointed out, it seems the first rows are incorrect since they behave differently from the left, right, and bottom mirrors.