static void Main(string[] args)
{
var @params = new MPSolverParameters();
@params.SetDoubleParam(MPSolverParameters.DoubleParam.RELATIVE_MIP_GAP, 0);
@params.SetDoubleParam(MPSolverParameters.DoubleParam.PRIMAL_TOLERANCE, 0);
@params.SetDoubleParam(MPSolverParameters.DoubleParam.DUAL_TOLERANCE, 0);
var solver = new Solver("BOP_Knapsack", (Solver.OptimizationProblemType) 12);
BuildModel(solver);
var result = solver.Solve(@params);
Console.WriteLine("Using BOP:");
Console.WriteLine("result: " + result);
Console.WriteLine("objective: " + solver.Objective().Value());
Console.WriteLine("bound: " + solver.Objective().BestBound());
solver = new Solver("CBC_Knapsack", (Solver.OptimizationProblemType) 5);
BuildModel(solver);
result = solver.Solve(@params);
Console.WriteLine("Using CBC:");
Console.WriteLine("result: " + result);
Console.WriteLine("objective: " + solver.Objective().Value());
Console.WriteLine("bound: " + solver.Objective().BestBound());
}
private ResultState SolveInternal()
{
PrintDebugRessourcesBefore("SolveInternal");
var param = new MPSolverParameters();
param.SetDoubleParam(MPSolverParameters.RELATIVE_MIP_GAP, MIP_GAP);
if (timelimit != 0)
{
solver.SetTimeLimit(timelimit);
}
#if DEBUG
solver.EnableOutput();
#else
solver.SuppressOutput();
#endif
resultState = FromGoogleResultState(solver.Solve(param));
PrintDebugRessourcesAfter();
#if DEBUG
PrintDebugOutput();
#endif
return(resultState);
}
// TODO: TBD: taking LinearSolver assembly(ies) out of the build configuration for the time being until a usage/migration path can be established...
/// <summary>
/// Builds the <see cref="MPSolverParameters"/> instance given a set of
/// <see cref="MpParamSpec"/> pairs.
/// </summary>
/// <param name="specs"></param>
/// <returns></returns>
protected virtual MPSolverParameters BuildParameters(params MpParamSpec[] specs)
{
var parameters = new MPSolverParameters();
foreach (var(spec, value) in specs)
{
parameters.SetDoubleParam(spec.ForSolver(), value);
}
ClrCreatedObjects.Add(parameters);
return(parameters);
}
private MPSolverParameters BuildParameters(IEnumerable <double> values)
{
var parameters = new MPSolverParameters();
// ReSharper disable PossibleMultipleEnumeration
for (var i = 0; i < values.Count(); i++)
{
parameters.SetDoubleParam(i, values.ElementAt(i));
// ReSharper enable PossibleMultipleEnumeration
}
ClrCreatedObjects.Add(parameters);
return(parameters);
}