Dcm2wigner.m

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Converts a directional cosine matrix into second-rank Wigner function matrix. Rows and columns of the resulting Wigner matrix are sorted by descending ranks, that is:

                        [D( 2,2)  ...  D( 2,-2)
                           ...    ...    ...  
                         D(-2,2)  ...  D(-2,-2)]

The resulting Wigner matrix is to be used as v=W*v, where v is a column vector of irreducible spherical tensor coefficients, listed vertically in the following order: T(2,2), T(2,1), T(2,0), T(2,-1), T(2,-2).