1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2 /*                                                                           */
3 /*                  This file is part of the program and library             */
4 /*         SCIP --- Solving Constraint Integer Programs                      */
5 /*                                                                           */
6 /*    Copyright (C) 2002-2021 Konrad-Zuse-Zentrum                            */
7 /*                            fuer Informationstechnik Berlin                */
8 /*                                                                           */
9 /*  SCIP is distributed under the terms of the ZIB Academic License.         */
10 /*                                                                           */
11 /*  You should have received a copy of the ZIB Academic License              */
12 /*  along with SCIP; see the file COPYING. If not visit scipopt.org.         */
13 /*                                                                           */
14 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
15 
16 /**@file   heur_coefdiving.h
17  * @ingroup PRIMALHEURISTICS
18  * @brief  LP diving heuristic that chooses fixings w.r.t. the matrix coefficients
19  * @author Tobias Achterberg
20  *
21  * Diving heuristic: Iteratively fixes some fractional variable and resolves the LP-relaxation, thereby simulating a
22  * depth-first-search in the tree. Coefficient Diving chooses the variable with the fewest locking number in any
23  * direction and rounds it into this direction. One-level backtracking is applied: If the LP gets infeasible, the last
24  * fixing is undone, and the opposite fixing is tried. If this is infeasible, too, the procedure aborts.
25  */
26 
27 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
28 
29 #ifndef __SCIP_HEUR_COEFDIVING_H__
30 #define __SCIP_HEUR_COEFDIVING_H__
31 
32 #include "scip/def.h"
33 #include "scip/type_retcode.h"
34 #include "scip/type_scip.h"
35 
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39 
40 /** creates the coefdiving heuristic and includes it in SCIP
41  *
42  *  @ingroup PrimalHeuristicIncludes
43  */
44 SCIP_EXPORT
45 SCIP_RETCODE SCIPincludeHeurCoefdiving(
46    SCIP*                 scip                /**< SCIP data structure */
47    );
48 
49 #ifdef __cplusplus
50 }
51 #endif
52 
53 #endif
54