Back to basics 8 - Matrix Diagonals
middleAsColumn: Return all but first and last element as a column vector
Check if number exists in vector
Sum the elements in either diagonal of a square matrix
01 - Scalar variables
02 - Vector Variables 3
04 - Scalar Equations 1
06 - Matrix Equations 3
02 - Vector Variables 2
05 - Vector Equations 2
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