Scippy

SCIP

Solving Constraint Integer Programs

presol_dualinfer.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) 2002-2017 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_dualinfer.h
17  * @brief dual inference presolver
18  * @author Dieter Weninger
19  *
20  * This presolver exploits dual information for primal variable fixings:
21  * 1. The first method is an enhanced dual fixing technique.
22  * 2. The second method does dual bound strengthening on continuous primal
23  * variables and applies complementary slackness \f$(A^T y - c)_i > 0 \Rightarrow x_i = 0\f$
24  * for fixing primal variables at their lower bound.
25  *
26  */
27 
28 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
29 
30 #ifndef __SCIP_PRESOL_DUALINFER_H__
31 #define __SCIP_PRESOL_DUALINFER_H__
32 
33 
34 #include "scip/scip.h"
35 
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39 
40 /** creates the dual inference presolver and includes it in SCIP
41  *
42  * @ingroup PresolverIncludes
43  */
44 extern
45 SCIP_RETCODE SCIPincludePresolDualinfer(
46  SCIP* scip /**< SCIP data structure */
47  );
48 
49 #ifdef __cplusplus
50 }
51 #endif
52 
53 #endif
SCIP_RETCODE
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:53
SCIPincludePresolDualinfer
SCIP_RETCODE SCIPincludePresolDualinfer(SCIP *scip)
Definition: presol_dualinfer.c:1305
scip.h
SCIP callable library.