public static void main(String[] args) throws Exception {
   fw = new FileWriter("/Users/Main/Desktop/test.csv", false); // ※1
   pw = new PrintWriter(new BufferedWriter(fw));
   for (range = 1; range < 1000000; range *= 2) {
     for (int j = 0; j < 3; j++) {
       for (int i = 0; i < 1; i++) {
         Vector X = Vector.generate(n, range);
         Matrix A = Matrix.generate(n, n, range);
         Vector B = A.multi(X);
         pw.print(range);
         pw.print(",");
         pw.print(n);
         System.out.println(n);
         analysisGaussianEliminationWithPivot(A, B, X);
         System.out.println();
       }
     }
   }
   pw.close();
 }