Need a test case with a 0 on the chosen diagonal.
Agree with Jon's comment that the matrix should contain 0 elements
so simple that it never occurred to me
So many choices
Generate a NaN...on purpose
Maximum value in a matrix
What is Sum Of all elements of Matrix
Add more zeros
Permute diagonal and antidiagonal
Rank of magic square (for beginners)
Find the path through the cell
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