Make fMat be a 5x3 matrix of random integers with values from -3 to 3
(Hint: use randi)
Test for randomness could be tightened (cf. Solution 1490988).
Remove any row in which a NaN appears
Sum the elements in either diagonal of a square matrix
Back to basics - mean of corner elements of a matrix
Find out total non zero element of matrix
03 - Matrix Variables 3
03 - Matrix Variables 4
01 - Scalar variables
07 - Common functions and indexing 5
04 - Scalar Equations 3
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