write a function that gives the indexes of rising or falling edge
x is a vector (assume it contains always at least one element)
str is a string with value 'up' or 'down', describing if you must return indexes of rising or falling edges
Tell me the slope
Factorize THIS, buddy
Project Euler: Problem 7, Nth prime
Back to basics 15 - classes
Magic is simple (for beginners)
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