Scippy

SCIP

Solving Constraint Integer Programs

heur_coefdiving.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 2002-2022 Zuse Institute Berlin */
7 /* */
8 /* Licensed under the Apache License, Version 2.0 (the "License"); */
9 /* you may not use this file except in compliance with the License. */
10 /* You may obtain a copy of the License at */
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14 /* Unless required by applicable law or agreed to in writing, software */
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17 /* See the License for the specific language governing permissions and */
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19 /* */
20 /* You should have received a copy of the Apache-2.0 license */
21 /* along with SCIP; see the file LICENSE. If not visit scipopt.org. */
22 /* */
23 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
24 
25 /**@file heur_coefdiving.h
26  * @ingroup PRIMALHEURISTICS
27  * @brief LP diving heuristic that chooses fixings w.r.t. the matrix coefficients
28  * @author Tobias Achterberg
29  *
30  * Diving heuristic: Iteratively fixes some fractional variable and resolves the LP-relaxation, thereby simulating a
31  * depth-first-search in the tree. Coefficient Diving chooses the variable with the fewest locking number in any
32  * direction and rounds it into this direction. One-level backtracking is applied: If the LP gets infeasible, the last
33  * fixing is undone, and the opposite fixing is tried. If this is infeasible, too, the procedure aborts.
34  */
35 
36 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
37 
38 #ifndef __SCIP_HEUR_COEFDIVING_H__
39 #define __SCIP_HEUR_COEFDIVING_H__
40 
41 #include "scip/def.h"
42 #include "scip/type_retcode.h"
43 #include "scip/type_scip.h"
44 
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48 
49 /** creates the coefdiving heuristic and includes it in SCIP
50  *
51  * @ingroup PrimalHeuristicIncludes
52  */
53 SCIP_EXPORT
55  SCIP* scip /**< SCIP data structure */
56  );
57 
58 #ifdef __cplusplus
59 }
60 #endif
61 
62 #endif
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:63
type definitions for return codes for SCIP methods
type definitions for SCIP&#39;s main datastructure
SCIP_RETCODE SCIPincludeHeurCoefdiving(SCIP *scip)
common defines and data types used in all packages of SCIP