Scippy

SCIP

Solving Constraint Integer Programs

prop_pseudoobj.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) 2002-2014 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 prop_pseudoobj.h
17  * @ingroup PROPAGATORS
18  * @brief Pseudo objective propagator
19  * @author Tobias Achterberg
20  * @author Stefan Heinz
21  *
22  * This propagator propagates the objective function using the cutoff bound and the pseudo objective value. The pseudo
23  * objective value can be seen as minimum activity of the linear objective function. Using this, this propagator checks
24  * if variables with non-zero objective coefficients can exceed the cutoff bound. If this is the case the corresponding
25  * bound can be tightened.
26  */
27 
28 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
29 
30 #ifndef __SCIP_PROP_PSEUDOOBJ_H__
31 #define __SCIP_PROP_PSEUDOOBJ_H__
32 
33 
34 #include "scip/scip.h"
35 
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39 
40 /** creates the pseudo objective function propagator and includes it in SCIP */
41 extern
43  SCIP* scip /**< SCIP data structure */
44  );
45 
46 /** propagates the cutoff bound for the given variables */
47 extern
49  SCIP* scip, /**< SCIP data structure */
50  SCIP_PROP* prop, /**< propagator, or NULL */
51  SCIP_VAR* var, /**< variables to propagate */
52  SCIP_Real cutoffbound, /**< cutoff bound to use */
53  SCIP_Real pseudoobjval, /**< pseudo objective value to use */
54  SCIP_Bool* tightened /**< pointer to if the domain was tightened */
55  );
56 
57 #ifdef __cplusplus
58 }
59 #endif
60 
61 #endif
62