Accord.Tests.Math.BrentSearchTest.FindRootTest C# (CSharp) Method

        public void FindRootTest()
        {
            //  Example from http://en.wikipedia.org/wiki/Brent%27s_method

            Func<double, double> f = x => (x + 3) * Math.Pow((x - 1), 2);
            double a = -4;
            double b = 4 / 3.0;

            double expected = -3;
            double actual = BrentSearch.FindRoot(f, a, b);

            Assert.AreEqual(expected, actual, 1e-6);
            Assert.IsFalse(Double.IsNaN(actual));
        }