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
Triangle Numbers Below N
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Cell Counting: How Many Draws?
03 - Matrix Variables 1
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