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POsolver solve constraint programming problem
 

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    <p>Do anyone know any simple solver that can solve linear constraint math models? Example a simple model:</p> <pre><code>a + b + c = 100; a/b/c = 2/3/4; a &gt; d </code></pre> <p>I'm using MS Solver foundation and this is my C# code, but it throw UnsolvableModelException:</p> <pre><code> SolverContext solverContext = SolverContext.GetContext(); Model model = solverContext.CreateModel(); Decision a = new Decision(Domain.Real, "a"); Decision b = new Decision(Domain.Real, "b"); model.AddDecisions(a, b); model.AddConstraint("fator", a / b == 4); model.AddConstraint("sum", a + b == 5); Solution solution = solverContext.Solve(new ConstraintProgrammingDirective()); Report report = solution.GetReport(); Console.WriteLine("a = {0} ; b = {1}", a, b); </code></pre> <p>Thanks for any help</p> <p><strong>Edit:</strong></p> <p>Because int CSP(constraint sstisfaction programming) problem, you shouldn't use any Directive when solving it. The code should be:</p> <pre><code> SolverContext solverContext = SolverContext.GetContext(); Model model = solverContext.CreateModel(); Decision a = new Decision(Domain.Real, "a"); Decision b = new Decision(Domain.Real, "b"); model.AddDecisions(a, b); model.AddConstraint("fator", a / b == 4); model.AddConstraint("sum", a + b == 5); Solution solution = solverContext.Solve(); Report report = solution.GetReport(); Console.WriteLine("a = {0} ; b = {1}", a, b); </code></pre> <p>However, I don't know why I ran to slowly I only need the first solution in the solution set.</p>
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    1. COI can find a CSP samsple for MSF. Therefore, I know where the problem is. Thanks anyway
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