Write a function that calculates the ratio between the sum of the prime numbers lower or equal than x, and the sum of the non-prime numbers lower than x.
test case #2 is not correct.
Remove any row in which a NaN appears
Remove NaN ?
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Find a Pythagorean triple
Draw a 'Z'.
Alternate list of elements
Alternating 1´s and 0´s in a matrix
Check if is a square
Double the next!
Approximate the inverse tangent by power series
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