Submitter | Variables | Constraints | Density | Status | Group | Objective | MPS File |
---|---|---|---|---|---|---|---|

Jesus Rodriguez | 48597 | 582237 | 6.19629e-05 | open | hgms | -44837.24534313961* | hgms62.mps.gz |

Maintenance scheduling of generators in hydropower systems

Detailed explanation of the following tables can be found here.

Original | Presolved | |
---|---|---|

Variables | 48597 | 44730 |

Constraints | 582237 | 577169 |

Binaries | 547 | 524 |

Integers | 0 | 0 |

Continuous | 48050 | 44206 |

Implicit Integers | 0 | 0 |

Fixed Variables | 3844 | 0 |

Nonzero Density | 6.19629e-05 | 5.48082e-05 |

Nonzeroes | 1753240 | 1414970 |

Original | Presolved | |
---|---|---|

Total | 582237 | 577169 |

Empty | 0 | 0 |

Free | 0 | 0 |

Singleton | 49 | 0 |

Aggregations | 1478 | 1478 |

Precedence | 0 | 0 |

Variable Bound | 18294 | 334015 |

Set Partitioning | 65 | 65 |

Set Packing | 36 | 36 |

Set Covering | 8 | 8 |

Cardinality | 0 | 0 |

Invariant Knapsack | 54 | 52 |

Equation Knapsack | 97 | 97 |

Bin Packing | 0 | 0 |

Knapsack | 0 | 0 |

Integer Knapsack | 0 | 0 |

Mixed Binary | 562156 | 241418 |

General Linear | 0 | 0 |

Indicator | 0 | 0 |

Available nonzero structure and decomposition information. Further information can be found here.

Decomposed structure of original problem (dec-file)

Decomposed structure after trivial presolving (dec-file)

value | min | median | mean | max | |
---|---|---|---|---|---|

Components | |||||

Constraint % | |||||

Variable % | |||||

Score |

Find solutions below. Download the archive containing all solutions from the Download page.

`## Warning in lapply(df["exactobjval"], as.numeric): NAs introduced by coercion`

ID | Objective | Exact | Int. Viol | Cons. Viol | Obj. Viol | Submitter | Date | Description |
---|---|---|---|---|---|---|---|---|

4 | -44837.25 | -44837.25 | 0 | 0 | 0 | Michael Winkler | 2022-02-25 | Found with Gurobi 9.5 |

3 | -44835.70 | 0 | 0 | 0 | Edward Rothberg | 2019-12-13 | Obtained with Gurobi 9.0 | |

2 | -44827.83 | 0 | 0 | 0 | Robert Ashford and Alkis Vazacopoulus | 2019-12-18 | Found using ODH|CPlex | |

1 | -44819.68 | -44819.68 | 0 | 0 | 0 | - | 2018-10-12 | Solution found during MIPLIB2017 problem selection. |

The following instances are most similar to hgms62 in the collection. This similarity analysis is based on 100 scaled instance features describing properties of the variables, objective function, bounds, constraints, and right hand sides.

```
@unpublished{key ,
author = {Jesus Rodriguez, Miguel Anjos, Pascal Côté, Guy Desaulniers},
title = {Generator maintenance scheduling in hydro-power systems: MIP formulations and model selection},
note = {Manuscript in preparation},
year = {2017}
}
```

Last Update Mar 04, 2024 by Julian Manns

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