The only thing missing from the test suite are nans,regardless, it's a very good problem. Learned how to extract minus from minus 0, and finally took my time to learn about the controversial denormal floating-points numbers.
This is an elegant and very MATLAB solution--looks easy to vectorize or adapt to single conversion as well.
Combinations without using nchoosek
Create matrix of replicated elements
Sum the elements in either diagonal of a square matrix
Parsing Expressions - Binary Arithmetic Operators I
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