public static double second_diff_2(IntroducedFunction f, Coord x, int number_1, int number_2)
{
double dx = 1e-5;
int length = x.coord.Length;
Coord x_dx_1 = dx * Coord.Ort(length, number_1);
Coord x_dx_2 = dx * Coord.Ort(length, number_2);
return((f.Answer(x + x_dx_1 + x_dx_2) - f.Answer(x + x_dx_1 - x_dx_2) - f.Answer(x - x_dx_1 + x_dx_2) + f.Answer(x - x_dx_1 - x_dx_2)) / (4 * dx * dx));
}
public static double diff_4(IntroducedFunction f, Coord x, int number)
{
double dx = 1e-5;
int length = x.coord.Length;
Coord x_dx = dx * Coord.Ort(length, number);
return((-f.Answer(x + 2 * x_dx) + 8 * f.Answer(x + x_dx) - 8 * f.Answer(x - x_dx) + f.Answer(x - 2 * x_dx)) / (12 * dx));
//return (-f(x + 2 * x_dx, parts) + 8 * f(x + x_dx, parts) - 8 * f(x - x_dx, parts) + f(x - 2 * x_dx, parts)) / (12 * dx);
}
//Значение функции в новой точке
override public double f(double alfa)
{
point(alfa);
return(y.Answer(x1));
}