public static double Third(baseFunc func, double a, double b, double step)
{
double n = (b - a) / step;
double result = 0;
for (double i = a + step; i <= b; i += step)
{
result += func(i - step + step / 2f);
}
return(((b - a) / n) * result);
}
public static double First(baseFunc func, double a, double b, double step)
{
double n = (b - a) / step;
double result = 0;
for (double i = a; i <= b - step; i += step)
{
result += func(i);
}
return(((b - a) / n) * result);
}
public static double MethodTrap(baseFunc func, double a, double b, double accur)
{
double n = 1000;
double h = (b - a) / n;
double temp = 0;
for (double i = 0; i <= b - h; i += h)
{
temp += ((func(i) + func(i + h)) * h) / 2;
}
return(temp);
}
public static double MethodSimpsona(baseFunc func, double a, double b, double accur)
{
double n = 1001;
double h = (b - a) / n;
double temp = func(a) + func(b);
for (double i = 0, j = 0; i <= b - h; i += h, j++)
{
if (j % 2 == 0)
{
temp += 2 * func(i);
}
else
{
temp += 4 * func(i);
}
}
return((temp * h) / 3f);
}
