[16288] | 1 | using System;
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| 2 | using System.Linq;
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| 3 | using System.Collections.Generic;
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| 4 | using Google.OrTools.LinearSolver;
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| 5 | using HeuristicLab.Common;
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| 6 | using HeuristicLab.Core;
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[11753] | 7 | using HeuristicLab.Data;
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[16172] | 8 | using HeuristicLab.MathematicalOptimization.LinearProgramming.Problems;
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[11753] | 9 | using HeuristicLab.Optimization;
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| 10 | using HeuristicLab.Problems.Programmable;
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[16288] | 11 | using Variable = Google.OrTools.LinearSolver.Variable;
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[11753] | 12 |
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[16172] | 13 | namespace HeuristicLab.MathematicalOptimization.LinearProgramming {
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[16233] | 14 |
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[16172] | 15 | public class CompiledLinearProgrammingProblemDefinition : CompiledProblemDefinition, ILinearProgrammingProblemDefinition {
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| 16 | private Variable x;
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| 17 | private Variable y;
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[16288] | 18 |
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[11753] | 19 | public override void Initialize() {
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[11880] | 20 | // Use vars.yourVariable to access variables in the variable store i.e. yourVariable
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| 21 | // Add additional initialization code e.g. private variables that you need for evaluating
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[11753] | 22 | }
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[16288] | 23 |
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[16172] | 24 | public void BuildModel(Solver solver) {
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[11880] | 25 | // Use vars.yourVariable to access variables in the variable store i.e. yourVariable
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[16233] | 26 | // Example model taken from https://developers.google.com/optimization/mip/integer_opt
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[16172] | 27 | // Define the decision variables
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| 28 | x = solver.MakeIntVar(0, 3.5, "x");
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| 29 | y = solver.MakeIntVar(0, double.PositiveInfinity, "y");
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| 30 | // Define the constraints
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| 31 | solver.Add(x + 7 * y <= 17.5);
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| 32 | // Define the objective
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| 33 | solver.Maximize(x + 10 * y);
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[11753] | 34 | }
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[16288] | 35 |
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[16172] | 36 | public void Analyze(Solver solver, ResultCollection results) {
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[11880] | 37 | // Use vars.yourVariable to access variables in the variable store i.e. yourVariable
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[16172] | 38 | // Write or update results given the solution variables of the decision variables
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| 39 | results.AddOrUpdateResult("x", new DoubleValue(x.SolutionValue()));
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| 40 | results.AddOrUpdateResult("y", new DoubleValue(y.SolutionValue()));
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| 41 | // The decision variables can also be retrieved from the solver
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| 42 | //results.AddOrUpdateResult("x", new DoubleValue(solver.LookupVariableOrNull("x").SolutionValue()));
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| 43 | //results.AddOrUpdateResult("y", new DoubleValue(solver.LookupVariableOrNull("y").SolutionValue()));
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[11753] | 44 | }
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[16288] | 45 |
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[11880] | 46 | // Implement further classes and methods
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[11753] | 47 | }
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[16288] | 48 | }
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| 49 |
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