This should be quite straightforward but at 2a.m. my brains are not working 100%. ;)
I has exactly the same idea!!
but on the second line I used directly the logical indexing... ;-)
Sums with Excluded Digits
Reverse the vector
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Find the logic
Mmm! Multi-dimensional Matrix Multiplication
Return 'on' or 'off'
Only once: cleaning up your columns
Wayfinding 5 - Travel contour
A SUBSREF variant that accepts the 'end'-operator.
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