c Simple big matrix manipulation example.
    
      program matrix
      
      integer m(20, 15), n(20, 15), r(20, 15)
      integer i, j 
      
      data m/0, 1, 2, 8, 0, 1, 6, 8, 9, 2, 0, 1, 4, 8, 1, 9, 5, 9, 6, 4,
     +       7, 6, 3, 3, 9, 2, 0, 3, 5, 8, 3, 3, 5, 9, 4, 7, 0, 7, 3, 7,
     +       4, 2, 8, 3, 6, 3, 9, 9, 0, 3, 2, 3, 8, 5, 6, 7, 3, 1, 5, 9,
     +       0, 8, 4, 5, 2, 9, 5, 3, 7, 5, 8, 4, 5, 5, 4, 7, 2, 7, 6, 1,
     +       2, 4, 9, 5, 8, 8, 4, 0, 5, 4, 6, 2, 8, 1, 2, 8, 9, 6, 3, 4,
     +       4, 0, 8, 9, 6, 4, 8, 9, 3, 9, 5, 5, 3, 1, 0, 4, 4, 3, 9, 7,
     +       5, 6, 9, 7, 4, 8, 7, 6, 3, 3, 4, 6, 8, 4, 7, 3, 9, 0, 8, 9,
     +       8, 7, 7, 8, 5, 4, 4, 4, 1, 3, 7, 7, 2, 3, 5, 9, 4, 1, 3, 0,
     +       4, 4, 1, 9, 8, 6, 0, 2, 7, 4, 5, 2, 4, 6, 3, 2, 7, 5, 3, 6,
     +       8, 1, 5, 0, 2, 7, 2, 3, 8, 4, 5, 3, 6, 5, 7, 7, 4, 1, 8, 3,
     +       2, 4, 9, 3, 1, 1, 2, 9, 6, 0, 3, 6, 8, 0, 1, 3, 7, 9, 5, 4,
     +       3, 7, 7, 8, 1, 9, 7, 1, 9, 9, 4, 9, 5, 5, 4, 1, 8, 3, 7, 1,
     +       1, 3, 5, 9, 2, 3, 9, 8, 1, 6, 8, 7, 1, 7, 3, 7, 4, 6, 0, 0,
     +       8, 5, 3, 0, 7, 1, 3, 0, 0, 5, 2, 2, 8, 5, 7, 0, 2, 7, 2, 6,
     +       1, 5, 4, 7, 0, 8, 6, 1, 6, 1, 6, 7, 3, 3, 1, 2, 5, 1, 3, 0/  
      data n/9, 8, 7, 1, 9, 8, 3, 1, 0, 7, 9, 8, 5, 1, 8, 0, 4, 0, 3, 5,
     +       2, 3, 6, 6, 0, 7, 9, 6, 4, 1, 6, 6, 4, 0, 5, 2, 9, 2, 6, 2,
     +       5, 7, 1, 6, 3, 6, 0, 0, 9, 6, 7, 6, 1, 4, 3, 2, 6, 8, 4, 0,
     +       9, 1, 5, 4, 7, 0, 4, 6, 2, 4, 1, 5, 4, 4, 5, 2, 7, 2, 3, 8,
     +       7, 5, 0, 4, 1, 1, 5, 9, 4, 5, 3, 7, 1, 8, 7, 1, 0, 3, 6, 5,
     +       5, 9, 1, 0, 3, 5, 1, 0, 6, 0, 4, 4, 6, 8, 9, 5, 5, 6, 0, 2,
     +       4, 3, 0, 2, 5, 1, 2, 3, 6, 6, 5, 3, 1, 5, 2, 6, 0, 9, 1, 0,
     +       1, 2, 2, 1, 4, 5, 5, 5, 8, 6, 2, 2, 7, 6, 4, 0, 5, 8, 6, 9,
     +       5, 5, 8, 0, 1, 3, 9, 7, 2, 5, 4, 7, 5, 3, 6, 7, 2, 4, 6, 3,
     +       1, 8, 4, 9, 7, 2, 7, 6, 1, 5, 4, 6, 3, 4, 2, 2, 5, 8, 1, 6,
     +       7, 5, 0, 6, 8, 8, 7, 0, 3, 9, 6, 3, 1, 9, 8, 6, 2, 0, 4, 5,
     +       6, 2, 2, 1, 8, 0, 2, 8, 0, 0, 5, 0, 4, 4, 5, 8, 1, 6, 2, 8,
     +       8, 6, 4, 0, 7, 6, 0, 1, 8, 3, 1, 2, 8, 2, 6, 2, 5, 3, 9, 9,
     +       1, 4, 6, 9, 2, 8, 6, 9, 9, 4, 7, 7, 1, 4, 2, 9, 7, 2, 7, 3,
     +       8, 4, 5, 2, 9, 1, 3, 8, 3, 8, 3, 2, 6, 6, 8, 7, 4, 8, 6, 9/
      do 20 i = 1, 20   
          do 10 j = 1, 15
              r((i * i) / i, 1 + j - 1) = 
     +            m((i * 2) / 2, j * 1) + n(i + 0, 0 + j)               
10        continue
20    continue  

      write(*, *) r
     
      stop
      end