Similar to Problem 42501. Toeplitize a matrix, let's consider Hankelization of a matrix.
Given an input matrix A, convert it to a Hankel matrix B by replacing each skew-diagonal of A with its mean. For example,
Input
A = [3 7 10 2
3 5 1 2
6 3 2 7]
Output:
B = [3 5 7 2
5 7 2 2
7 2 2 7]
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