It seems easy, but...
You cannot use +, -, plus, diff, cumsum, *, prod, times, etc.
conv([x y],[1 1],'valid') will not work as it contains STRINGS !!
Very witty solution.
Select every other element of a vector
Inner product of two vectors
Generate a vector like 1,2,2,3,3,3,4,4,4,4
RGB to CMYK
Wien's displacement law
Create an n-by-n null matrix and fill with ones certain positions
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