Scippy

SCIP

Solving Constraint Integer Programs

Functions
branch_leastinf.h File Reference
Branching Rules

Detailed Description

least infeasible LP branching rule

Author
Tobias Achterberg

The least infeasible branching rule selects a candidate variable $j$ with fractional solution value $ \hat{x}_j$ which maximizes

\[ \max \left\{ \lceil \hat{x}_j \rceil - \hat{x}_j, \hat{x}_j - \lfloor \hat{x}_j \rfloor \right\}. \]

i. e., a variable which already is closest to being integral among all branching candidates.

The least infeasible rule and many other branching rules of SCIP are explained and compared in

Tobias Achterberg
Constraint Integer Programming
PhD Thesis, Technische Universität Berlin, 2007

Definition in file branch_leastinf.h.

#include "scip/scip.h"

Go to the source code of this file.

Functions

SCIP_RETCODE SCIPincludeBranchruleLeastinf (SCIP *scip)
 

Function Documentation

SCIP_RETCODE SCIPincludeBranchruleLeastinf ( SCIP *  scip)

creates the least infeasible LP branching rule and includes it in SCIP

Parameters
scipSCIP data structure

Definition at line 357 of file branch_leastinf.c.

References BRANCHRULE_DESC, BRANCHRULE_MAXBOUNDDIST, BRANCHRULE_MAXDEPTH, BRANCHRULE_NAME, BRANCHRULE_PRIORITY, NULL, SCIP_CALL, SCIP_OKAY, SCIPincludeBranchruleBasic(), SCIPsetBranchruleCopy(), SCIPsetBranchruleExecExt(), and SCIPsetBranchruleExecLp().

Referenced by SCIP_DECL_BRANCHCOPY(), and SCIPincludeDefaultPlugins().