This problem has been polished along with an enhanced test suite.
nice moderate problem
Convert a numerical matrix into a cell array of strings
Doubling elements in a vector
Vectors counting by 2
Array of Ones
Convert array of decimal numbers into hexadecimal numbers array.
For given vectors x,y find coresponding spline coefficients.
Find sum of negative elements in row.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Calculate roots of polynomial given as vector array.
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