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).
Sums with Excluded Digits
Remove NaN ?
Getting logical indexes
Generate a random matrix A of (1,-1)
03 - Matrix Variables 2
07 - Common functions and indexing 4
07 - Common functions and indexing 2
05 - Vector Equations 2
02 - Vector Variables 4
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