Accord.Tests.Statistics.ChiSquareDistributionTest.LogProbabilityDensityFunctionTest C# (CSharp) Method

        public void LogProbabilityDensityFunctionTest()
        {
            int degreesOfFreedom;
            double actual, expected, x;
            ChiSquareDistribution target;

            degreesOfFreedom = 1;
            target = new ChiSquareDistribution(degreesOfFreedom);
            x = 1;
            actual = target.LogProbabilityDensityFunction(x);
            expected = System.Math.Log(target.ProbabilityDensityFunction(x));
            Assert.AreEqual(expected, actual, 1e-10);

            degreesOfFreedom = 2;
            target = new ChiSquareDistribution(degreesOfFreedom);
            x = 2;
            actual = target.LogProbabilityDensityFunction(x);
            expected = System.Math.Log(target.ProbabilityDensityFunction(x));
            Assert.AreEqual(expected, actual, 1e-10);

            degreesOfFreedom = 10;
            target = new ChiSquareDistribution(degreesOfFreedom);
            x = 2;
            actual = target.LogProbabilityDensityFunction(x);
            expected = System.Math.Log(target.ProbabilityDensityFunction(x));
            Assert.AreEqual(expected, actual, 1e-10);
        }