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
Multiply 2 numbers
Replace multiples of 5 with NaN
Is this triangle right-angled?
Sum of big primes without primes
Numbers spiral diagonals (Part 1)
Getting the indices from a matrix
Negation and new variables
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