Exemple #1
0
    private static void laplace_sample_test()

//****************************************************************************80
//
//  Purpose:
//
//    LAPLACE_SAMPLE_TEST tests LAPLACE_SAMPLE.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license.
//
//  Modified:
//
//    27 February 2007
//
//  Author:
//
//    John Burkardt
//
    {
        const int SAMPLE_NUM = 1000;

        int i;
        int seed = 123456789;

        double[] x = new double [SAMPLE_NUM];

        Console.WriteLine("");
        Console.WriteLine("LAPLACE_SAMPLE_TEST");
        Console.WriteLine("  LAPLACE_MEAN computes the Laplace mean;");
        Console.WriteLine("  LAPLACE_SAMPLE samples the Laplace distribution;");
        Console.WriteLine("  LAPLACE_VARIANCE computes the Laplace variance;");

        double a = 1.0;
        double b = 2.0;

        Console.WriteLine("");
        Console.WriteLine("  PDF parameter A =      " + a + "");
        Console.WriteLine("  PDF parameter B =      " + b + "");

        if (!Laplace.laplace_check(a, b))
        {
            Console.WriteLine("");
            Console.WriteLine("LAPLACE_SAMPLE_TEST - Fatal error!");
            Console.WriteLine("  The parameters are not legal.");
            return;
        }

        double mean     = Laplace.laplace_mean(a, b);
        double variance = Laplace.laplace_variance(a, b);

        Console.WriteLine("");
        Console.WriteLine("  PDF mean =     " + mean + "");
        Console.WriteLine("  PDF variance = " + variance + "");

        for (i = 0; i < SAMPLE_NUM; i++)
        {
            x[i] = Laplace.laplace_sample(a, b, ref seed);
        }

        mean     = typeMethods.r8vec_mean(SAMPLE_NUM, x);
        variance = typeMethods.r8vec_variance(SAMPLE_NUM, x);
        double xmax = typeMethods.r8vec_max(SAMPLE_NUM, x);
        double xmin = typeMethods.r8vec_min(SAMPLE_NUM, x);

        Console.WriteLine("");
        Console.WriteLine("  Sample size =     " + SAMPLE_NUM + "");
        Console.WriteLine("  Sample mean =     " + mean + "");
        Console.WriteLine("  Sample variance = " + variance + "");
        Console.WriteLine("  Sample maximum =  " + xmax + "");
        Console.WriteLine("  Sample minimum =  " + xmin + "");
    }