The problem says the input is a positive integer but the first test inputs 0. In my code that caused r = 0/0 error. Please change the wording to "input is non-negative".
Omit columns averages from a matrix
Remove the two elements next to NaN value
Find the hypotenuse
Divide by 4
Draw a 'X'!
Return area of square
Number of odd and even elements within matrix
Mean and standard deviation of times in string
Create matrix with Gray code
Make a vector of prime numbers
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