* test function to compute eigen values of a 2x2 matrix * \f[\begin{bmatrix} * -4& 4& 2& 0& -3\\ * 4& -4& 4& -3& -1\\ * 2& 4& 4& 3& -3\\ * 0& -3& 3& -1&-1\\ * -3& -1& -3& -3& 0 * \end{bmatrix}\f] * which are approximately, {9.27648, -9.26948, 2.0181, -1.03516, -5.98994} */
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