static void Test_2(int m)
{
int i, n = 20;
CLTF cos = new CLTF(-3.0, 3.0, n, F314, " Test_2");
SW.Write(" Интерполяцияю Полином лагранжа {0}-го порядка:", m);
string txt = "\r\n"; double xz, fz, Ln, err;
for (i = 1; i <= n; i++)
{
xz = 0.5 * (cos.Points[i - 1].X + cos.Points[i].X);
Ln = CLIn.Polynomial_Lagrange(m, xz, cos.Points);
fz = F314(xz);
err = Math.Abs(Ln - fz);
txt += $"{i,4}{xz,8:F3}{fz,18:F12}{Ln,18:F12}{err,18:F12}\r\n";
}
SW.Write(txt);
SW.Close();
}
static void Test_1()
{
CLTF table = new CLTF(-1.5, 1.5, 5, F311, " Test_1");
table.Roots_correction(1.0E-10);
SW.WriteLine(table.Table_of_Function());
SW.WriteLine("\r\n Інтерполяція за Лагранжем: ");
double xz, fz, Ln, err; string txt = "";
for (int i = 1; i < table.Length; i++)
{
xz = 0.5 * (table.Points[i - 1].X + table.Points[i].X);
fz = F311(xz);
Ln = CLIn.Polynomial_Lagrange(xz, table.Points);
err = Math.Abs(Ln - fz);
txt += $"{i,4}{xz,8:F3}{fz,18:F12}{Ln,18:F12}{err,18:F12}\r\n";
}
SW.Write(txt);
SW.Close();
}
public static double L316(double x)
{
return(CLIn.Polynomial_Lagrange(m, x, Table_G.Points));
}