Given the radius x, y would be the area of a circle.
Pi = 3.1416
Why change pi? there is pi built into matlab.
Project Euler: Problem 1, Multiples of 3 and 5
Return the first and last character of a string
Make a run-length companion vector
multiply by three
Log of a number
Write a code that will follow the equation y = x * (x + x) * x.
Vector with a repeated entry
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