simplex crash ordering
Decides how CPLEX orders variables relative to the objective function when selecting an initial basis.
Purpose
Simplex crash ordering
| API | Parameter Name | Name prior to V12.6.0 |
|---|---|---|
| C | CPXPARAM_Simplex_Crash | CPX_PARAM_CRAIND |
| C++ | IloCplex::Param::Simplex::Crash | CraInd (int) |
| OPL | craind | |
| Interactive | simplex crash | simplex crash |
| Identifier | 1007 | 1007 |
Description
Decides how CPLEX orders variables relative to the objective function when selecting an initial basis.
| Value | Meaning |
|---|---|
| LP Primal | |
| -1 | Alternate ways of using objective coefficients |
| 0 | Ignore objective coefficients during crash |
| 1 | Alternate ways of using objective coefficients; default |
| LP Dual | |
| -1 | Aggressive starting basis |
| 0 | Aggressive starting basis |
| 1 | Default starting basis; default |
| QP Primal | |
| -1 | Slack basis |
| 0 | Ignore Q terms and use LP solver for crash |
| 1 | Ignore objective and use LP solver for crash; default |
| QP Dual | |
| -1 | Slack basis |
| 0 | Use Q terms for crash |
| 1 | Use Q terms for crash; default |