get 2D array from text file

I'm trying to get the 2D array from the text file. So far I accessed the file and got all the numbers in the file, but all these numbers are string so I used split() and then convert it to double. How can convert this to double 2D array?

1.65 4.50 2.36 7.45 3.44 6.23

2.22 -3.24 -1.66 -5.48 3.46

4.23 2.29 5.29

2.76 3.76 4.29 5.48 3.43

3.38 3.65 3.76

2.46 3.34 2.38 8.26 5.34

This is what I have so far:

public static void main(String[] a) throws FileNotFoundException {

     File file =  new File("district3.txt");

     Scanner scan = new Scanner(file); 
     String b; 
     String[] c;

     int r = 6;

     double[][]arr = new double[r][];


     while(scan.hasNextLine()) {
        //get number as String
        b = scan.nextLine();

        //split them 
         c = b.split(" ");

         for(String i:c)
            System.out.println(Double.parseDouble(i) );




     } 

}