code: public static void printMatrix(int rows, int cols, Matrix m) {
          for(int col_num = 0; col_num < cols; col_num++) {
              for (int row_num = 0; row_num < rows; row_num++) {
                  System.out.print(m.get(row_num,col_num) + " ");
              }
              System.out.print("\n");
          }
          System.out.print("\n");
      }
docs: prints the {@code Matrix} to standard out.
  
  @param rows an {@code int} containing the number of rows in m
  @param cols an {@code int} containing the number of cols in m
  @param m the {@code Matrix} to print
  @return void