Accord.Tests.Math.QuadraticObjectiveFunctionTest.FunctionTest C# (CSharp) Method

        public void FunctionTest()
        {
            double x = 0;
            double y = 0;

            Func<double> expected = () => -2 * x * x + x * y - y * y + 5 * y;
            var actual = new QuadraticObjectiveFunction("-2x² + xy - y² + 5y");

            for (int i = 0; i < 10; i++)
            {
                for (int j = 0; j < 10; j++)
                {
                    x = (i - 5) / 10.0;
                    y = (j - 5) / 10.0;

                    double a = actual.Function(new[] { x, y });
                    double e = expected();

                    Assert.AreEqual(e, a, 1e-10);
                    Assert.IsFalse(Double.IsNaN(a));
                    Assert.IsFalse(Double.IsNaN(e));
                }
            }
        }