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.
Determine whether a vector is monotonically increasing
Project Euler: Problem 2, Sum of even Fibonacci
Remove NaN ?
Remove the two elements next to NaN value
Create an n-by-n null matrix and fill with ones certain positions
RGB to CMYK
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