This problem has been polished along with an enhanced test suite.
Make a checkerboard matrix
Select every other element of a vector
Energy of a photon
Divide by 4
String Array Basics, Part 1: Convert Cell Array to String Array; No Missing Values
Calculate the sum of elements of n*n Hilbert matrix.
Find hen's weight.
Find cosine between two given vectors u and v.
Calculate the values of a polynomial.
Find product of eigenvalues of n*n magic matrix.
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