private static void pvand_test()
//****************************************************************************80
//
// Purpose:
//
// PVAND_TEST tests PVAND.
//
// Licensing:
//
// This code is distributed under the GNU LGPL license.
//
// Modified:
//
// 23 February 2014
//
// Author:
//
// John Burkardt
//
{
const int N = 5;
double[] alpha = null;
double[] alpha1 = { 0.0, 1.0, 2.0, 3.0, 4.0 };
int test;
double[] x1 = { 5.0, 3.0, 4.0, 1.0, 2.0 };
Console.WriteLine("");
Console.WriteLine("PVAND_TEST:");
Console.WriteLine(" Solve a Vandermonde linear system A*x=b");
for (test = 1; test <= 2; test++)
{
switch (test)
{
case 1:
alpha = typeMethods.r8vec_copy_new(N, alpha1);
break;
case 2:
int seed = 123456789;
alpha = UniformRNG.r8vec_uniform_01_new(N, ref seed);
break;
}
typeMethods.r8vec_print(N, alpha, " Vandermonde vector ALPHA:");
double[] a = VandermondeMatrix.vand1(N, alpha);
double[] x = typeMethods.r8vec_copy_new(N, x1);
double[] b = typeMethods.r8mat_mv_new(N, N, a, x);
typeMethods.r8vec_print(N, b, " Right hand side B:");
x = VandermondeMatrix.pvand(N, alpha, b);
typeMethods.r8vec_print(N, x, " Solution X:");
}
}
private static void dvandprg_test()
//****************************************************************************80
//
// Purpose:
//
// DVANDPRG_TEST tests DVANDPRG.
//
// Licensing:
//
// This code is distributed under the GNU LGPL license.
//
// Modified:
//
// 18 April 2014
//
// Author:
//
// John Burkardt
//
{
const int N = 5;
double[] alpha = null;
double[] alpha1 = { 0.0, 1.0, 2.0, 3.0, 4.0 };
int test;
double[] x1 = { 5.0, 3.0, 4.0, 1.0, 2.0 };
Console.WriteLine("");
Console.WriteLine("DVANDPRG_TEST:");
Console.WriteLine(" Solve a Vandermonde linear system A'*x=b");
Console.WriteLine(" progressively.");
Console.WriteLine(" First we use ALPHA = 0, 1, 2, 3, 4.");
Console.WriteLine(" Then we choose ALPHA at random.");
for (test = 1; test <= 2; test++)
{
switch (test)
{
case 1:
alpha = typeMethods.r8vec_copy_new(N, alpha1);
break;
case 2:
int seed = 123456789;
alpha = UniformRNG.r8vec_uniform_01_new(N, ref seed);
break;
}
typeMethods.r8vec_print(N, alpha, " Vandermonde vector ALPHA:");
double[] a = VandermondeMatrix.vand1(N, alpha);
double[] x = typeMethods.r8vec_copy_new(N, x1);
double[] b = typeMethods.r8mat_mtv_new(N, N, a, x);
typeMethods.r8vec_print(N, b, " Right hand side B:");
x = new double[N];
double[] c = new double[N];
double[] m = new double[N];
int nsub;
for (nsub = 1; nsub <= N; nsub++)
{
VandermondeMatrix.dvandprg(nsub, alpha, b, ref x, ref c, ref m);
typeMethods.r8vec_print(nsub, x, " Solution X:");
}
}
}
