SCIP

Solving Constraint Integer Programs

heur_veclendiving.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_veclendiving.h
17  * @ingroup PRIMALHEURISTICS
18  * @brief LP diving heuristic that rounds variables with long column vectors
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. Vectorlength Diving chooses the variable with the smallest ratio of potential
23  * objective change and number of affected constraints and fixes it. One-level backtracking is applied: If the LP gets
24  * infeasible, the last fixings is undone, and the opposite fixing is tried. If this is infeasible, too, the procedure
25  * aborts.
26  */
27
28 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
29
30 #ifndef __SCIP_HEUR_VECLENDIVING_H__
31 #define __SCIP_HEUR_VECLENDIVING_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 veclendiving 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
type definitions for SCIP&#39;s main datastructure
SCIP_EXPORT SCIP_RETCODE SCIPincludeHeurVeclendiving(SCIP *scip)
common defines and data types used in all packages of SCIP