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.
Number of 1s in the Binary Representation of a Number
Getting the row and column location from a matrix
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Flip the vector from right to left
Produce a cosine wave
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