Similar to Problem 3094. Hankelize a matrix, now consider Toeplitization of a matrix.
Given an input matrix A, convert it to a Toeplitz matrix B by replacing the diagonal of A with the mean of the respective diagonal. For example,
Input
A = [6 3 2 7
3 5 1 2
3 7 10 2]
Output:
B = [7 2 2 7
5 7 2 2
3 5 7 2]
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