Package com.artelys.kalis

Class KClpLinearRelaxationSolver

    • Constructor Detail

      • KClpLinearRelaxationSolver

        protected KClpLinearRelaxationSolver​(long cPtr,
                                     boolean cMemoryOwn)

      • KClpLinearRelaxationSolver

        public KClpLinearRelaxationSolver​(KLinearRelaxation relax,
                                  KNumVar obj,
                                  int sense,
                                  int storedBasisSize)
        Constructor (note: no default constructor).

        Parameters:
        relax - domain (a linear relaxation)
        obj - the objective variable
        sense - the sense for optimization
        storedBasisSize - maximum depth for basis reload

      • KClpLinearRelaxationSolver

        public KClpLinearRelaxationSolver​(KLinearRelaxation relax,
                                  KNumVar obj,
                                  int sense)
        Constructor (note: no default constructor).

        Parameters:
        relax - domain (a linear relaxation)
        obj - the objective variable
        sense - the sense for optimization

    • Method Detail

      • setObjective

        public void setObjective​(KNumVar var)
        Set objective variable.
        Overrides:
        setObjective in class KRelaxationSolver
        Parameters:
        var - the new objective variable

      • solve

        public int solve()
        Call the solver.
        Call (Clp solver) and return an error code (see class KLinearRelaxationSolver for its meaning).
        Overrides:
        solve in class KRelaxationSolver

      • getBound

        public double getBound()
        Description copied from class: KRelaxationSolver
        Get the (lower for minimization, upper for maximization) bound computed by solve().

        Note that :
        - solve() method must be called before the getBound() method
        - moreover, the return code provided by solve() must be checked before using the value
        returned by getBound().
        Overrides:
        getBound in class KRelaxationSolver

      • getBestBound

        public double getBestBound()
        Get the best bound in a branch and bound tree.
        Useful if search terminated before optimality.
        Overrides:
        getBestBound in class KRelaxationSolver

      • print

        public void print()
        Print the internal state of the solver.
        Use is discouraged, use method `writeLP` to output the content of the solver.
        Overrides:
        print in class KRelaxationSolver

      • writeLP

        public int writeLP​(java.lang.String filename)
        Write the current problem to a file in lp format.
        Overrides:
        writeLP in class KLinearRelaxationSolver
        Parameters:
        filename - the path of the file to write (existing file is overwrited, if any)
        Returns:
        return code is reserved for future use (for now, errors are trapped by an exception)

      • printSolution

        public void printSolution​(boolean MIPflag)

      • printVariables

        public void printVariables()
        Print variables name and their rank.

        This is useful to recover the meaning of the columns in the LP file produced by `writeLP`.

      • getMIPSolution

        public double getMIPSolution​(KNumVar var)
        Get the current MIP solution for a KNumVar variable.

        Overrides:
        getMIPSolution in class KRelaxationSolver
        Parameters:
        var - variable whose value is checked
        Returns:
        value of var in the current MIP solution

      • getMIPSolution

        public double getMIPSolution​(KAuxVar var)
        Get the current MIP solution for a KAuxVar variable.

        Overrides:
        getMIPSolution in class KRelaxationSolver
        Parameters:
        var - variable whose value is checked
        Returns:
        value of var in the current MIP solution

      • getLPSolution

        public double getLPSolution​(KNumVar var)
        Get the current MIP solution for a KNumVar variable.

        Overrides:
        getLPSolution in class KRelaxationSolver
        Parameters:
        var - variable whose value is checked
        Returns:
        value of var in the current MIP solution

      • getLPSolution

        public double getLPSolution​(KAuxVar var)
        Get the current LP solution for a KAuxVar variable.
        Overrides:
        getLPSolution in class KRelaxationSolver
        Parameters:
        var - variable whose value is checked
        Returns:
        value of var in the current solution

      • updateSolution

        public void updateSolution​(boolean MIPflag)
        Update the KHybridSolution object with the current MIP (MIPflag=true) or LP (MIPflag=false) solution.

        Parameters:
        MIPflag - true to get the current MIP solution, false for LP.

      • getSolutionPtr

        public KHybridSolution getSolutionPtr()
        Get a pointer to the solution contained in the solver.
        Method `updateSolution` must be used before the call.

      • getReducedCost

        public double getReducedCost​(KNumVar var)
        Note that LP solve must be complete.

        Overrides:
        getReducedCost in class KLinearRelaxationSolver
        Parameters:
        var - the variable whose reduced cost in the current LP solution is retrieved
        Returns:
        reduced cost value

      • printSolverOutput

        public void printSolverOutput​(boolean flag)
        Activate or deactivate solver verbose output.

      • printSolverOutput

        public void printSolverOutput​(boolean flag,
                              com.artelys.kalis.SWIGTYPE_p_void callback,
                              com.artelys.kalis.SWIGTYPE_p_void userPtr)

      • setPresolve

        public void setPresolve​(boolean arg0)
        Activate or deactivate presolve.