I would recommend more test cases, including some of matrices.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Back to basics - mean of corner elements of a matrix
Sum of the Matrix Elements
Matlab Basics - Absolute Value
Test Problem; Create a 5x5 array containing all ones
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