private static void diffusivity_1d_pwc_test()
//****************************************************************************80
//
// Purpose:
//
// diffusivity_1d_pwc_test tests diffusivity_1d_pwc.
//
// Licensing:
//
// This code is distributed under the GNU LGPL license.
//
// Modified:
//
// 24 March 2019
//
// Author:
//
// John Burkardt
//
{
string command_filename = "diffusivity_1d_pwc_commands.txt";
List <string> command_unit = new();
string data_filename = "diffusivity_1d_pwc_data.txt";
List <string> data_unit = new();
double[] vc =
{
1.0, 1.5, 3.0, 1.2, 1.0, 0.8, 0.2, 0.4, 0.8, 1.0
}
;
double[] xc =
{
-0.9, -0.5, -0.45, -0.1, 0.2, 0.3, 0.32, 0.7, 0.85
}
;
Console.WriteLine("");
Console.WriteLine("diffusivity_1d_pwc_test");
Console.WriteLine(" Test diffusivity_1d_pwc.");
//
// Set up the spatial grid.
//
int nc = 10;
//
// Sample the diffusivity.
//
int np = 100;
double x_min = -1.0;
double x_max = +1.0;
double[] xp = typeMethods.r8vec_linspace_new(np, x_min, x_max);
//
// Compute the diffusivity field.
//
double[] vp = Stochastic.diffusivity_1d_pwc(nc, xc, vc, np, xp);
//
// Create data file.
//
for (int j = 0; j < np; j++)
{
data_unit.Add(" " + xp[j].ToString(CultureInfo.InvariantCulture).PadLeft(14)
+ " " + vp[j].ToString(CultureInfo.InvariantCulture).PadLeft(14) + "");
}
File.WriteAllLines(data_filename, data_unit);
Console.WriteLine("");
Console.WriteLine(" Created graphics data file '" + data_filename + "'");
//
// Create the command file.
//
double vp_max = typeMethods.r8vec_max(np, vp);
command_unit.Add("# " + command_filename + "");
command_unit.Add("#");
command_unit.Add("# Usage:");
command_unit.Add("# gnuplot < " + command_filename + "");
command_unit.Add("#");
command_unit.Add("set term png");
command_unit.Add("set output 'diffusivity_1d_pwc.png'");
command_unit.Add("set xlabel '<---X--->'");
command_unit.Add("set ylabel '<---Rho(X)--->'");
command_unit.Add("set yrange [0.0:" + vp_max + "]");
command_unit.Add("set title 'PWC 1D Stochastic diffusivity function'");
command_unit.Add("set grid");
command_unit.Add("set style data lines");
command_unit.Add("plot '" + data_filename + "' using 1:2 lw 3 linecolor rgb 'red'");
File.WriteAllLines(command_filename, command_unit);
Console.WriteLine(" Created graphics command file '" + command_filename + "'");
}
