Saving an array of numbers into a .txt file

Hi, I need to save an array of numbers into a “.txt” file, any ideas to do that with Proof?
I tried something like:“Difference.txt”);

for(int i=0; i<15; i++){
  for(int j=0; j<15; j++)

  data>> twod_vector[i][j];


But still can’t get the output file.

Try the other direction:

data << twod_vector[i][j];`

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