Accord.Tests.Math.HilbertTransformTest.FHTTest C# (CSharp) Method

        public void FHTTest()
        {
            Complex[] original = { (Complex)1, (Complex)2, (Complex)3, (Complex)4 };

            Complex[] actual = (Complex[])original.Clone();
            HilbertTransform.FHT(actual, FourierTransform.Direction.Forward);

            Assert.AreEqual(actual[0].Real, 1);
            Assert.AreEqual(actual[1].Real, 2);
            Assert.AreEqual(actual[2].Real, 3);
            Assert.AreEqual(actual[3].Real, 4);

            Assert.AreEqual(actual[0].Imaginary, +1, 0.000000001);
            Assert.AreEqual(actual[1].Imaginary, -1, 0.000000001);
            Assert.AreEqual(actual[2].Imaginary, -1, 0.000000001);
            Assert.AreEqual(actual[3].Imaginary, +1, 0.000000001);

            HilbertTransform.FHT(actual, FourierTransform.Direction.Backward);

            Assert.AreEqual(actual[0], original[0]);
            Assert.AreEqual(actual[1], original[1]);
            Assert.AreEqual(actual[2], original[2]);
            Assert.AreEqual(actual[3], original[3]);
        }