Scippy

SCIP

Solving Constraint Integer Programs

heur_shifting.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 heur_shifting.h
17  * @ingroup PRIMALHEURISTICS
18  * @brief LP rounding heuristic that tries to recover from intermediate infeasibilities and shifts continuous variables
19  * @author Tobias Achterberg
20  *
21  * This heuristic is similar to the Rounding heuristic (see @ref heur_rounding.h), but it tries to continue in the case
22  * that no rounding can decrease the violation of a linear constraint. In this case, the value of a continuous variable
23  * or an integer variable with integral value will be shifted in order to decrease the violation of the constraint. To
24  * avoid cycling, the procedure terminates after a certain number of non-improving shifts.
25  */
26 
27 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
28 
29 #ifndef __SCIP_HEUR_SHIFTING_H__
30 #define __SCIP_HEUR_SHIFTING_H__
31 
32 
33 #include "scip/scip.h"
34 
35 #ifdef __cplusplus
36 extern "C" {
37 #endif
38 
39 /** creates the shifting heuristic and includes it in SCIP */
40 extern
42  SCIP* scip /**< SCIP data structure */
43  );
44 
45 #ifdef __cplusplus
46 }
47 #endif
48 
49 #endif
50