Sort a list of complex numbers based on far they are from the origin.
Get the length of a given vector
Replace multiples of 5 with NaN
Union of two set decreasing order
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Form a square matrix from four square sub-matrices
Multiply two polynomials p and q given in in vector representation.
Calculate roots of polynomial given as vector array.
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