1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 2 /* */ 3 /* This file is part of the program and library */ 4 /* SCIP --- Solving Constraint Integer Programs */ 5 /* */ 6 /* Copyright (c) 2002-2023 Zuse Institute Berlin (ZIB) */ 7 /* */ 8 /* Licensed under the Apache License, Version 2.0 (the "License"); */ 9 /* you may not use this file except in compliance with the License. */ 10 /* You may obtain a copy of the License at */ 11 /* */ 12 /* http://www.apache.org/licenses/LICENSE-2.0 */ 13 /* */ 14 /* Unless required by applicable law or agreed to in writing, software */ 15 /* distributed under the License is distributed on an "AS IS" BASIS, */ 16 /* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */ 17 /* See the License for the specific language governing permissions and */ 18 /* limitations under the License. */ 19 /* */ 20 /* You should have received a copy of the Apache-2.0 license */ 21 /* along with SCIP; see the file LICENSE. If not visit scipopt.org. */ 22 /* */ 23 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 24 25 /**@file heur_zirounding.h 26 * @ingroup PRIMALHEURISTICS 27 * @brief ZI Round primal heuristic 28 * @author Gregor Hendel 29 * 30 * ZI Round (C. Wallace, Journal of Heuristics 2009) reduces the integer infeasibility of an LP solution step-by-step by 31 * shifting fractional values towards integrality, but not necessarily rounding them. For each integer variable with 32 * fractional solution value, the heuristic calculates bounds for both possible rounding directions such that the 33 * obtained solution stays LP-feasible. The solution value is then shifted by the corresponding bound into the direction 34 * which reduces the fractionality most. 35 */ 36 37 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/ 38 39 #ifndef __SCIP_HEUR_ZIROUNDING_H__ 40 #define __SCIP_HEUR_ZIROUNDING_H__ 41 42 #include "scip/def.h" 43 #include "scip/type_retcode.h" 44 #include "scip/type_scip.h" 45 46 #ifdef __cplusplus 47 extern "C" { 48 #endif 49 50 /** creates the zirounding primal heuristic and includes it in SCIP 51 * 52 * @ingroup PrimalHeuristicIncludes 53 */ 54 SCIP_EXPORT 55 SCIP_RETCODE SCIPincludeHeurZirounding( 56 SCIP* scip /**< SCIP data structure */ 57 ); 58 59 #ifdef __cplusplus 60 } 61 #endif 62 63 #endif 64