Sum the numbers on the main diagonal of an n-by-n matrix.
A = [1 2 4
3 6 2
2 4 7]
The output value should equal 14.
Find all elements less than 0 or greater than 10 and replace them with NaN
Doubling elements in a vector
Colon operator of two vectors
Output any real number that is neither positive nor negative
03 - Matrix Variables 3
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