This problem has been polished and the test suite expanded and improved.
Swap the input arguments
Generate a string like abbcccddddeeeee
Return area of square
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Find scalar product of two polynomials a and b, given as vector array.
Find sum of negative elements in row.
Select primes from the matrix.
Find cosine between two given vectors u and v.
Find the volume of cone
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