Compute the sum of diagonal elements of a square matrix and store the larger sum to s.
Eg : a = [1 2 3; 2 3 4; 4 5 10]
sum of diagonal 1 = 1+3+10=14
sum of diagonal 2 = 3+3+4=10
The sum of the numbers in the vector
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04 - Scalar Equations 1
07 - Common functions and indexing 2
Sum of diagonals elements of a matrix
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