Scippy

    SCIP

    Solving Constraint Integer Programs

    Functions
    heur_nlpdiving.h File Reference
    Public API of SCIP » Plugin API of SCIP » Primal Heuristics

    Detailed Description

    NLP diving heuristic that chooses fixings w.r.t. the fractionalities.

    Author
    Timo Berthold
    Stefan Vigerske

    Diving heuristic: Iteratively fixes some fractional variables and resolves the LP and NLP relaxations, thereby simulating a depth-first-search in the tree. Double Diving chooses the variable for which the sum of the distances from the relaxations' solutions to a common integer value is minimal and rounds it to thenearest integer. One-level backtracking is applied: If the NLP gets infeasible, the last fixing is undone, and the opposite fixing is tried. If this is infeasible, too, the procedure aborts.

    Definition in file heur_nlpdiving.h.

    #include "scip/def.h"
    #include "scip/type_retcode.h"
    #include "scip/type_scip.h"

    Go to the source code of this file.

    Functions

    SCIP_RETCODE SCIPincludeHeurNlpdiving (SCIP *scip)