The Barrier Log
The first line of the barrier log displays statistics about the Cholesky decomposition needed by the barrier algorithm. This line contains the following values:
| Dense cols | The number of dense columns identified in the factorization. |
| NZ(L) | The number of nonzero elements in the Cholesky factorization. |
| Flops | The number of floating point operations needed to perform one factorization. |
During the barrier optimization, a summary log is displayed in every iteration. This summary log has the form:
| Its | The number of iterations taken so far. |
| P.inf | Maximal violation of primal constraints. |
| D.inf | Maximal violation of dual constraints. |
| U.inf | Maximal violation of upper bounds. |
| Primal obj | Value of the primal objective function. |
| Dual obj | Value of the dual objective function. |
| Compl | Value of the average complementarity. |
After the barrier algorithm a crossover procedure may be applied. This process prints at most 3 log lines about the different phases of the crossover procedure. The structure of these lines follows The Simplex Log described in the section above.
If BAROUTPUT is set to 0, no log is displayed until the barrier algorithm finishes.