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_nlpdiving.h
17  * @ingroup PRIMALHEURISTICS
18  * @brief  NLP diving heuristic that chooses fixings w.r.t. the fractionalities
19  * @author Timo Berthold
20  * @author Stefan Vigerske
21  *
22  * Diving heuristic: Iteratively fixes some fractional variable and resolves the NLP-relaxation, thereby simulating a
23  * depth-first-search in the tree. Fractional Diving chooses the variable with the highest fractionality and rounds it to the
24  * nearest integer. One-level backtracking is applied: If the NLP gets infeasible, the last fixing is undone, and the
25  * opposite fixing is tried. If this is infeasible, too, the procedure aborts.
26  */
27 
28 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
29 
30 #ifndef __SCIP_HEUR_NLPDIVING_H__
31 #define __SCIP_HEUR_NLPDIVING_H__
32 
33 #include "scip/def.h"
34 #include "scip/type_retcode.h"
35 #include "scip/type_scip.h"
36 
37 #ifdef __cplusplus
38 extern "C" {
39 #endif
40 
41 /** creates the fracdiving heuristic and includes it in SCIP
42  *
43  *  @ingroup PrimalHeuristicIncludes
44  */
45 SCIP_EXPORT
46 SCIP_RETCODE SCIPincludeHeurNlpdiving(
47    SCIP*                 scip                /**< SCIP data structure */
48    );
49 
50 #ifdef __cplusplus
51 }
52 #endif
53 
54 #endif
55