This problem has been polished along with an enhanced test suite.
Back to basics 23 - Triangular matrix
Create a vector whose elements depend on the previous element
Add two numbers
Convert a Cell Array into an Array
Find my daddy long leg (No 's')
Set x value to each even index of vector y.
Sum positive elements of matrix.
Find cosine between two given vectors u and v.
Select primes from the matrix.
Find sum of negative elements in row.
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