Mat Object: 3 MPI processes
  type: mpiaij
row 0: (0, 1.) 
row 1: (0, 0.5)  (1, 0.5) 
row 2: (1, 1.) 
row 3: (1, 0.5)  (2, 0.5) 
row 4: (2, 1.) 
row 5: (2, 0.5)  (3, 0.5) 
row 6: (3, 1.) 
row 7: (3, 0.5)  (4, 0.5) 
row 8: (4, 1.)