Scippy

SCIP

Solving Constraint Integer Programs

heur_coefdiving.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) 2002-2024 Zuse Institute Berlin (ZIB) */
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8/* Licensed under the Apache License, Version 2.0 (the "License"); */
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23/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
24
25/**@file heur_coefdiving.h
26 * @ingroup PRIMALHEURISTICS
27 * @brief LP diving heuristic that chooses fixings w.r.t. the matrix coefficients
28 * @author Tobias Achterberg
29 *
30 * Diving heuristic: Iteratively fixes some fractional variable and resolves the LP-relaxation, thereby simulating a
31 * depth-first-search in the tree. Coefficient Diving chooses the variable with the fewest locking number in any
32 * direction and rounds it into this direction. One-level backtracking is applied: If the LP gets infeasible, the last
33 * fixing is undone, and the opposite fixing is tried. If this is infeasible, too, the procedure aborts.
34 */
35
36/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
37
38#ifndef __SCIP_HEUR_COEFDIVING_H__
39#define __SCIP_HEUR_COEFDIVING_H__
40
41#include "scip/def.h"
42#include "scip/type_retcode.h"
43#include "scip/type_scip.h"
44
45#ifdef __cplusplus
46extern "C" {
47#endif
48
49/** creates the coefdiving heuristic and includes it in SCIP
50 *
51 * @ingroup PrimalHeuristicIncludes
52 */
53SCIP_EXPORT
55 SCIP* scip /**< SCIP data structure */
56 );
57
58#ifdef __cplusplus
59}
60#endif
61
62#endif
common defines and data types used in all packages of SCIP
SCIP_RETCODE SCIPincludeHeurCoefdiving(SCIP *scip)
type definitions for return codes for SCIP methods
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:63
type definitions for SCIP's main datastructure