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.
Better bullseye matrix
Sum of diagonal of a square matrix
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Sum of diagonals elements of a matrix
Wien's displacement law
RGB to CMYK
Create an n-by-n null matrix and fill with ones certain positions
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