好的,这段代码在另一个问题中,但我不知道如何添加我更新的代码。我让这段代码正常工作并给出了正确的答案,但它并没有根据我的 while 循环条件停止。我不确定我在那里做错了什么?答案显然收敛并且所有值都是正确的,只是忽略了 while 循环。
/* Newton Raphson Method*/
import java.util.Scanner;
import static java.lang.Math.*;
public class NewtRaphEx {
// Creating Function f = x - cos(3.5x)
double f = 0.0;
double df = 0.0;
public static double function(double x) {
return (x - cos(3.5 * x));
}
public static double dfunction (double x) {
return (1 + 3.5*sin(3.5 * x));
}
public static void main (String[] args) {
//Initialising all variables
double xn = 0.06;
double xnew = 0.0;
double e_allow = 0.001;
double fn = 0.0;
double eps = 0.0;
double dfn = 0.0;
double dx = 0.0;
int n = 0;
int nMax = 10000;
do {
for (n = 0; n <= nMax; n++) {
fn = function(xn);
dfn = dfunction(xn);
dx = -(fn / dfn);
xnew = xn + dx;
xn = xnew;
eps = abs(dx / xn);
n = n + 1;
}
} while (eps <= e_allow || n < nMax);
System.out.print("N" + "\t" + "X" + "\t" + "F(x)" + "\t" + "dF(x)" + "\t");
System.out.println("delX" + "\t" + "X_new" + "\t" + "Epsilon");
System.out.format("%d\t" + "%.3f\t" + "%.3f\t" + "%.3f\t" + "%.3f\t" + "%.3f\t" + "%.3f", n, xn, fn, dfn, dx, xnew, eps);
}
}