TOMLAB
| Return Code | Description |
| 0 | Subroutine completed successfully. |
| 1 | Bad input encountered. |
| 2 | Bad or corrupt file - unrecoverable. |
| 4 | Memory error. |
| 8 | Corrupt use. |
| 16 | Program error. |
| 32 | Invalid call or invalid argument. |
| 128 | Sum of the primal infeasibilities for the Newton barrier algorithm. |