Scippy

SCIP

Solving Constraint Integer Programs

heur_oneopt.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_oneopt.h
17  * @ingroup PRIMALHEURISTICS
18  * @brief Improvement heuristic that alters single variable values
19  * @author Timo Berthold
20  *
21  * Oneopt is a straightforward improvement heuristic: given a feasible MIP solution, the value of
22  * an integer variable x<sub>j</sub> can be decreased for c<sub>j</sub> > 0 or increased for c<sub>j</sub> < 0
23  * if the resulting solution is still feasible. If more than one variable can be shifted, they are sorted by
24  * non-decreasing impact on the objective and sequentially shifted until no more improvements can be
25  * obtained.
26  */
27 
28 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
29 
30 #ifndef __SCIP_HEUR_ONEOPT_H__
31 #define __SCIP_HEUR_ONEOPT_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 oneopt primal 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 SCIPincludeHeurOneopt(SCIP *scip)
Definition: heur_oneopt.c:884
type definitions for SCIP&#39;s main datastructure
common defines and data types used in all packages of SCIP