SCIP
Solving Constraint Integer Programs
heur_simplerounding.c File Reference
Detailed Description
simple and fast LP rounding heuristic
The heuristic also tries to round relaxation solutions if available.
Definition in file heur_simplerounding.c.
#include "blockmemshell/memory.h"#include "scip/heur_simplerounding.h"#include "scip/pub_heur.h"#include "scip/pub_message.h"#include "scip/pub_var.h"#include "scip/scip_branch.h"#include "scip/scip_heur.h"#include "scip/scip_lp.h"#include "scip/scip_mem.h"#include "scip/scip_message.h"#include "scip/scip_numerics.h"#include "scip/scip_param.h"#include "scip/scip_prob.h"#include "scip/scip_sol.h"#include "scip/scip_solvingstats.h"#include "scip/scip_var.h"#include <string.h>Go to the source code of this file.
Macros | |
| #define | HEUR_NAME "simplerounding" |
| #define | HEUR_DESC "simple and fast LP rounding heuristic" |
| #define | HEUR_DISPCHAR SCIP_HEURDISPCHAR_ROUNDING |
| #define | HEUR_PRIORITY 0 |
| #define | HEUR_FREQ 1 |
| #define | HEUR_FREQOFS 0 |
| #define | HEUR_MAXDEPTH -1 |
| #define | HEUR_TIMING SCIP_HEURTIMING_DURINGLPLOOP | SCIP_HEURTIMING_DURINGPRICINGLOOP |
| #define | HEUR_USESSUBSCIP FALSE |
| #define | DEFAULT_ONCEPERNODE FALSE |
Functions | |
| static SCIP_RETCODE | performSimpleRounding (SCIP *scip, SCIP_SOL *sol, SCIP_VAR **cands, SCIP_Real *candssol, int ncands, SCIP_RESULT *result) |
| static SCIP_RETCODE | performLPSimpleRounding (SCIP *scip, SCIP_HEURDATA *heurdata, SCIP_HEURTIMING heurtiming, SCIP_RESULT *result) |
| static SCIP_RETCODE | performRelaxSimpleRounding (SCIP *scip, SCIP_HEURDATA *heurdata, SCIP_RESULT *result) |
| static | SCIP_DECL_HEURCOPY (heurCopySimplerounding) |
| static | SCIP_DECL_HEURFREE (heurFreeSimplerounding) |
| static | SCIP_DECL_HEURINIT (heurInitSimplerounding) |
| static | SCIP_DECL_HEUREXIT (heurExitSimplerounding) |
| static | SCIP_DECL_HEURINITSOL (heurInitsolSimplerounding) |
| static | SCIP_DECL_HEUREXITSOL (heurExitsolSimplerounding) |
| static | SCIP_DECL_HEUREXEC (heurExecSimplerounding) |
| SCIP_RETCODE | SCIPincludeHeurSimplerounding (SCIP *scip) |
Macro Definition Documentation
◆ HEUR_NAME
| #define HEUR_NAME "simplerounding" |
Definition at line 45 of file heur_simplerounding.c.
Referenced by SCIP_DECL_HEURCOPY(), SCIP_DECL_HEUREXEC(), SCIP_DECL_HEUREXIT(), SCIP_DECL_HEURFREE(), SCIP_DECL_HEURINIT(), SCIP_DECL_HEURINITSOL(), and SCIPincludeHeurSimplerounding().
◆ HEUR_DESC
| #define HEUR_DESC "simple and fast LP rounding heuristic" |
Definition at line 46 of file heur_simplerounding.c.
Referenced by SCIPincludeHeurSimplerounding().
◆ HEUR_DISPCHAR
| #define HEUR_DISPCHAR SCIP_HEURDISPCHAR_ROUNDING |
Definition at line 47 of file heur_simplerounding.c.
Referenced by SCIPincludeHeurSimplerounding().
◆ HEUR_PRIORITY
| #define HEUR_PRIORITY 0 |
Definition at line 48 of file heur_simplerounding.c.
Referenced by SCIPincludeHeurSimplerounding().
◆ HEUR_FREQ
| #define HEUR_FREQ 1 |
Definition at line 49 of file heur_simplerounding.c.
Referenced by SCIPincludeHeurSimplerounding().
◆ HEUR_FREQOFS
| #define HEUR_FREQOFS 0 |
Definition at line 50 of file heur_simplerounding.c.
Referenced by SCIPincludeHeurSimplerounding().
◆ HEUR_MAXDEPTH
| #define HEUR_MAXDEPTH -1 |
Definition at line 51 of file heur_simplerounding.c.
Referenced by SCIPincludeHeurSimplerounding().
◆ HEUR_TIMING
| #define HEUR_TIMING SCIP_HEURTIMING_DURINGLPLOOP | SCIP_HEURTIMING_DURINGPRICINGLOOP |
Definition at line 52 of file heur_simplerounding.c.
Referenced by SCIP_DECL_HEUREXITSOL(), and SCIPincludeHeurSimplerounding().
◆ HEUR_USESSUBSCIP
| #define HEUR_USESSUBSCIP FALSE |
does the heuristic use a secondary SCIP instance?
Definition at line 53 of file heur_simplerounding.c.
Referenced by SCIPincludeHeurSimplerounding().
◆ DEFAULT_ONCEPERNODE
| #define DEFAULT_ONCEPERNODE FALSE |
should the heuristic only be called once per node?
Definition at line 55 of file heur_simplerounding.c.
Referenced by SCIPincludeHeurSimplerounding().
Function Documentation
◆ performSimpleRounding()
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static |
perform rounding
- Parameters
-
scip SCIP main data structure sol solution to round cands candidate variables candssol solutions of candidate variables ncands number of candidates result pointer to store the result of the heuristic call
Definition at line 73 of file heur_simplerounding.c.
References FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_FOUNDSOL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIP_VARTYPE_IMPLINT, SCIPadjustImplicitSolVals(), SCIPallColsInLP(), SCIPdebugMsg, SCIPfeasCeil(), SCIPfeasFloor(), SCIPisFeasIntegral(), SCIPprintSol(), SCIPsetSolVal(), SCIPtrySol(), SCIPvarGetName(), SCIPvarGetObj(), SCIPvarGetStatus(), SCIPvarGetType(), SCIPvarMayRoundDown(), SCIPvarMayRoundUp(), and TRUE.
Referenced by performLPSimpleRounding(), and performRelaxSimpleRounding().
◆ performLPSimpleRounding()
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static |
perform LP-rounding
- Parameters
-
scip SCIP main data structure heurdata heuristic data heurtiming heuristic timing mask result pointer to store the result of the heuristic call
Definition at line 177 of file heur_simplerounding.c.
References NULL, performSimpleRounding(), SCIP_CALL, SCIP_HEURTIMING_DURINGPRICINGLOOP, SCIP_Longint, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIPdebugMsg, SCIPgetCutoffbound(), SCIPgetLPBranchCands(), SCIPgetLPObjval(), SCIPgetLPSolstat(), SCIPgetNLPs(), SCIPisGE(), and SCIPlinkLPSol().
Referenced by SCIP_DECL_HEUREXEC().
◆ performRelaxSimpleRounding()
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static |
perform relaxation solution rounding
- Parameters
-
scip SCIP main data structure heurdata heuristic data result pointer to store the result of the heuristic call
Definition at line 237 of file heur_simplerounding.c.
References NULL, performSimpleRounding(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPdebugMsg, SCIPfreeBufferArray, SCIPgetRelaxSolVal(), SCIPgetVarsData(), SCIPisFeasIntegral(), SCIPisRelaxSolValid(), and SCIPlinkRelaxSol().
Referenced by SCIP_DECL_HEUREXEC().
◆ SCIP_DECL_HEURCOPY()
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static |
copy method for primal heuristic plugins (called when SCIP copies plugins)
Definition at line 327 of file heur_simplerounding.c.
References HEUR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPheurGetName(), and SCIPincludeHeurSimplerounding().
◆ SCIP_DECL_HEURFREE()
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static |
destructor of primal heuristic to free user data (called when SCIP is exiting)
Definition at line 341 of file heur_simplerounding.c.
References HEUR_NAME, NULL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPheurGetData(), SCIPheurGetName(), and SCIPheurSetData().
◆ SCIP_DECL_HEURINIT()
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static |
initialization method of primal heuristic (called after problem was transformed)
Definition at line 361 of file heur_simplerounding.c.
References HEUR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPcreateSol(), SCIPheurGetData(), and SCIPheurGetName().
◆ SCIP_DECL_HEUREXIT()
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static |
deinitialization method of primal heuristic (called before transformed problem is freed)
Definition at line 380 of file heur_simplerounding.c.
References HEUR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeSol(), SCIPheurGetData(), and SCIPheurGetName().
◆ SCIP_DECL_HEURINITSOL()
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static |
solving process initialization method of primal heuristic (called when branch and bound process is about to begin)
Definition at line 397 of file heur_simplerounding.c.
References HEUR_NAME, NULL, SCIP_HEURTIMING_AFTERLPNODE, SCIP_OKAY, SCIPheurGetData(), SCIPheurGetName(), and SCIPheurSetTimingmask().
◆ SCIP_DECL_HEUREXITSOL()
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static |
solving process deinitialization method of primal heuristic (called before branch and bound process data is freed)
Definition at line 417 of file heur_simplerounding.c.
References HEUR_TIMING, SCIP_OKAY, and SCIPheurSetTimingmask().
◆ SCIP_DECL_HEUREXEC()
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static |
execution method of primal heuristic
Definition at line 428 of file heur_simplerounding.c.
References HEUR_NAME, NULL, performLPSimpleRounding(), performRelaxSimpleRounding(), SCIP_CALL, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_HEURTIMING_DURINGPRICINGLOOP, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIPgetCutoffbound(), SCIPgetLPObjval(), SCIPgetLPSolstat(), SCIPgetNBinVars(), SCIPgetNIntVars(), SCIPgetNLPs(), SCIPgetVars(), SCIPhasCurrentNodeLP(), SCIPheurGetData(), SCIPheurGetName(), SCIPisGE(), SCIPisRelaxSolValid(), SCIPvarMayRoundDown(), and SCIPvarMayRoundUp().