| DS_MAT_A | - first problem matrix | |
| DS_MAT_B | - second problem matrix | |
| DS_MAT_Q | - first orthogonal/unitary transformation that reduces to generalized (real) Schur form | |
| DS_MAT_Z | - second orthogonal/unitary transformation that reduces to generalized (real) Schur form |
| 0 | - QZ iteration (_gges) |