Find the sum of the elements in the "second" diagonal
Symmetry of vector
Determine the square root
Back to basics - mean of corner elements of a matrix
Sum the real and imaginary parts of a complex number
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Sum positive elements of matrix.
Count given word x in text.
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Find hen's weight.
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