Scippy

SCIP

Solving Constraint Integer Programs

heur_nlpdiving.h
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1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2 /* */
3 /* This file is part of the program and library */
4 /* SCIP --- Solving Constraint Integer Programs */
5 /* */
6 /* Copyright (C) 2002-2020 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  */
47  SCIP* scip /**< SCIP data structure */
48  );
49 
50 #ifdef __cplusplus
51 }
52 #endif
53 
54 #endif
#define SCIP_EXPORT
Definition: def.h:100
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:54
type definitions for return codes for SCIP methods
SCIP_EXPORT SCIP_RETCODE SCIPincludeHeurNlpdiving(SCIP *scip)
type definitions for SCIP&#39;s main datastructure
common defines and data types used in all packages of SCIP