//  This test matrix is real but stored using a complex type because the
//  shifted inverse power method generally works for complex matrices.
complex A[5][5] = {
    { -4, -3, -7,  5,  7 },
    {  0,  2, -7,  6, -6 },
    { -2, -6, -2,  4, -1 },
    { -1, -7, -5, -7, -1 },
    { -1, -2, -2, -8,  1 }};