Find Euclidean norm of given vector u.
Replace NaNs with the number that appears to its left in the row.
Array of Ones
Calculate square and cube of number
Sum positive elements of matrix.
Form a square matrix from four square sub-matrices
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Set x value to each odd index of vector y.
Select primes from the matrix.
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