F04AXF Example Program Data
  6 15                                                          : n, nz
   5.0  1  1   2.0  2  2  -1.0  2  3   2.0  2  4   3.0  3  3
  -2.0  4  1   1.0  4  4   1.0  4  5  -1.0  5  1  -1.0  5  4
   2.0  5  5  -3.0  5  6  -1.0  6  1  -1.0  6  2   6.0  6  6    : a
  15.0  12.0  18.0   3.0  -6.0   0.0                            : rhs