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
Matrix with different incremental runs
Find the sum of the elements in the "second" diagonal
Replace Vector Elements
Cody Matlab Version
Generate a vector like 1,2,2,3,3,3,4,4,4,4
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