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  1. public class testing_programm {
  2.     public static double epsilon = Math.pow(10,-3);
  3.     public static void main(String[] args) {
  4.         double x0[];
  5.         double x[] = {0,0,0};
  6.         double y[] = {-0.6, 0.868, 0.03};
  7.         double matrix[][] = {
  8.                 {0.5, 0.08, -0.04},
  9.                 {0.1, 0.5, -0.212},
  10.                 {-0.069, -0.29, 0.5}
  11.         };
  12.         int count = 0;
  13.         do {
  14.             x0 = x;
  15.             x = mul(matrix,x0);
  16.             for(int i = 0; i < x.length; i++) {
  17.                 x[i] += y[i];
  18.             }
  19.             count++;
  20.         }   while (check(x,x0));
  21.         System.out.println("Vector:");
  22.         for(int i = 0; i < x.length; i++) {
  23.             System.out.println(x[i]);
  24.         }
  25.         System.out.println("Amount of iterations = " + count + ";");
  26.     }
  27.     public static double[] mul (double[][] m, double[] v) {
  28.         double vector[] = new double[v.length];
  29.         for(int i = 0; i < v.length; i++){
  30.             for(int j = 0; j < m.length; j++) {
  31.                 vector[i] += m[i][j] * v[j];
  32.             }
  33.         }
  34.         return vector;
  35.     }
  36.     public static boolean check (double[] x1, double[] x2) {
  37.         double max = Math.abs(x1[0] - x2[0]);
  38.         for(int i = 1; i < x1.length; i++) {
  39.             if(Math.abs(x2[i] - x1[i]) > max) {
  40.                 max = Math.abs(x2[i] - x1[i]);
  41.             }
  42.         }
  43.         if(max < epsilon) {
  44.             return false;
  45.         }
  46.         return true;
  47.     }
  48. }
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