Scippy

SCIP

Solving Constraint Integer Programs

branch_leastinf.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) 2002-2023 Zuse Institute Berlin (ZIB) */
7 /* */
8 /* Licensed under the Apache License, Version 2.0 (the "License"); */
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21 /* along with SCIP; see the file LICENSE. If not visit scipopt.org. */
22 /* */
23 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
24 
25 /**@file branch_leastinf.h
26  * @ingroup BRANCHINGRULES
27  * @brief least infeasible LP branching rule
28  * @author Tobias Achterberg
29  *
30  * The least infeasible branching rule selects a candidate variable $j$ with fractional solution value \f$ \hat{x}_j\f$
31  * which maximizes
32  * \f[
33  * \max \left\{ \lceil \hat{x}_j \rceil - \hat{x}_j, \hat{x}_j - \lfloor \hat{x}_j \rfloor \right\}.
34  * \f]
35  * i. e., a variable which already is closest to being integral among all branching candidates.
36  *
37  * The least infeasible rule and many other branching rules of SCIP are explained and compared in
38  *
39  * @par
40  * Tobias Achterberg@n
41  * Constraint Integer Programming@n
42  * PhD Thesis, Technische Universit├Ąt Berlin, 2007@n
43  */
44 
45 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
46 
47 #ifndef __SCIP_BRANCH_LEASTINF_H__
48 #define __SCIP_BRANCH_LEASTINF_H__
49 
50 
51 #include "scip/def.h"
52 #include "scip/type_retcode.h"
53 #include "scip/type_scip.h"
54 
55 #ifdef __cplusplus
56 extern "C" {
57 #endif
58 
59 /** creates the least infeasible LP branching rule and includes it in SCIP
60  *
61  * @ingroup BranchingRuleIncludes
62  */
63 SCIP_EXPORT
65  SCIP* scip /**< SCIP data structure */
66  );
67 
68 #ifdef __cplusplus
69 }
70 #endif
71 
72 #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 SCIPincludeBranchruleLeastinf(SCIP *scip)
common defines and data types used in all packages of SCIP