1Mat Object: 2 MPI processes 2 type: nest 3 Matrix object: 4 type=nest, rows=2, cols=2 5 MatNest structure: 6 (0,0) : NULL 7 (0,1) : type=diagonal, rows=6, cols=6 8 (1,0) : type=constantdiagonal, rows=6, cols=6 9 (1,1) : NULL 10