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).
Implement simple rotation cypher
Find a Pythagorean triple
03 - Matrix Variables 2
02 - Vector Variables 5
06 - Matrix Equations 2
07 - Common functions and indexing 3
02 - Vector Variables 2
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