Scippy

SCIP

Solving Constraint Integer Programs

presol_dualcomp.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) 2002-2018 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 email to scip@zib.de. */
13 /* */
14 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
15 
16 /**@file presol_dualcomp.h
17  * @ingroup PRESOLVERS
18  * @brief dual compensation presolver
19  * @author Dieter Weninger
20  *
21  * This presolver looks for variables with
22  * i) objcoef >= 0 and exactly one downlock
23  * ii) objcoef <= 0 and exactly one uplock
24  * and fixes the variable in case i) at the lower bound and in case ii) at the
25  * upper bound if a combination of singleton continuous variables can compensate
26  * the downlock in case i) and the uplock in case ii).
27  */
28 
29 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
30 
31 #ifndef __SCIP_PRESOL_DUALCOMP_H__
32 #define __SCIP_PRESOL_DUALCOMP_H__
33 
34 
35 #include "scip/scip.h"
36 
37 #ifdef __cplusplus
38 extern "C" {
39 #endif
40 
41 /** creates the dualcomp presolver and includes it in SCIP
42  *
43  * @ingroup PresolverIncludes
44  */
45 extern
46 SCIP_RETCODE SCIPincludePresolDualcomp(
47  SCIP* scip /**< SCIP data structure */
48  );
49 
50 #ifdef __cplusplus
51 }
52 #endif
53 
54 #endif
SCIP_RETCODE
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:53
SCIPincludePresolDualcomp
SCIP_RETCODE SCIPincludePresolDualcomp(SCIP *scip)
Definition: presol_dualcomp.c:813
scip.h
SCIP callable library.