# SCIP

Solving Constraint Integer Programs

heur_zirounding.h
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1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2 /* */
3 /* This file is part of the program and library */
4 /* SCIP --- Solving Constraint Integer Programs */
5 /* */
7 /* fuer Informationstechnik Berlin */
8 /* */
10 /* */
12 /* along with SCIP; see the file COPYING. If not visit scipopt.org. */
13 /* */
14 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
15
16 /**@file heur_zirounding.h
17  * @ingroup PRIMALHEURISTICS
18  * @brief ZI Round primal heuristic
19  * @author Gregor Hendel
20  *
21  * ZI Round (C. Wallace, Journal of Heuristics 2009) reduces the integer infeasibility of an LP solution step-by-step by
22  * shifting fractional values towards integrality, but not necessarily rounding them. For each integer variable with
23  * fractional solution value, the heuristic calculates bounds for both possible rounding directions such that the
24  * obtained solution stays LP-feasible. The solution value is then shifted by the corresponding bound into the direction
25  * which reduces the fractionality most.
26  */
27
28 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
29
30 #ifndef __SCIP_HEUR_ZIROUNDING_H__
31 #define __SCIP_HEUR_ZIROUNDING_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 zirounding primal heuristic and includes it in SCIP
42  *
43  * @ingroup PrimalHeuristicIncludes
44  */
45 SCIP_EXPORT
47  SCIP* scip /**< SCIP data structure */
48  );
49
50 #ifdef __cplusplus
51 }
52 #endif
53
54 #endif
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:54
type definitions for return codes for SCIP methods
SCIP_RETCODE SCIPincludeHeurZirounding(SCIP *scip)
type definitions for SCIP&#39;s main datastructure
common defines and data types used in all packages of SCIP