Accord.Tests.Math.DistanceTest.MahalanobisTest2 C# (CSharp) Method

        public void MahalanobisTest2()
        {
            // Example from Statistical Distance Calculator
            // http://maplepark.com/~drf5n/cgi-bin/dist.cgi

            double[,] cov = 
            {
                { 1.030303, 2.132728, 0.576716 },
                { 2.132728, 4.510515, 1.185771 },
                { 0.576716, 1.185771, 0.398922 }
            };

            double[] x, y;
            double actual, expected;

            x = new double[] { 2, 4, 1 };
            y = new double[] { 0, 0, 0 };

            expected = 2.07735368677415;
            actual = Distance.Mahalanobis(x, y, cov.Inverse());
            Assert.AreEqual(expected, actual, 1e-10);


            x = new double[] { 7, 5, 1 };
            y = new double[] { 1, 0.52, -79 };

            expected = 277.8828871106366;
            actual = Distance.Mahalanobis(x, y, cov.Inverse());
            Assert.AreEqual(expected, actual, 0.0000000000001);
        }