How many Terms/Variables/Constraints/Non-Zeroes I defined in my Solver Foundation model?

Question

I'm using Microsoft Solver Foundation Express eddition in my program, Express version is limited in model size according this link.

Is there any way to find how many:

• Terms
• Variables
• Constraints
• Non-Zeros

I defined in my model, using code?

Answer 1

The Model class maintains Decisions and Constraints as collections. You could enumerate those and count them.

To keep track of your Term variables, you could create and count them by your own constructor method.

Example:

static Term NewTerm(Term t)
{
    noOfTerms++;   //  defined as class variable somewhere else
    return t;
}

static void Main(string[] args)
{
    var context = SolverContext.GetContext();
    var model = context.CreateModel();
    double sqrt2 = Math.Sqrt(2.0);

    var t = new Decision(Domain.RealRange(-sqrt2, +sqrt2), "t");
    var u = new Decision(Domain.RealRange(-2 * sqrt2, +2 * sqrt2), "u");

    model.AddDecisions(t, u);

    Term P = NewTerm(2 * t * t / (3 * t * t + u * u + 2 * t) - (u * u + t * t) / 18);

    model.AddGoal("objective", GoalKind.Maximize, P);

    Console.WriteLine("Constraints: " + model.Constraints.Count());
    Console.WriteLine("Decisions:   " + model.Decisions.Count());
    Console.WriteLine("Goals:       " + model.Goals.Count());
    Console.WriteLine("Terms:       " + noOfTerms);

    Solution sol = context.Solve();
    Report report = sol.GetReport();
    Console.WriteLine(report);
    Console.WriteLine();
}

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