0 0 0.000000
0 1 1.000000
0 2 2.000000
0 4 4.000000
*** Matrix A and vector x:
Mat Object: 1 MPI process
  type: shell
Vec Object: 1 MPI process
  type: seq
0.
1.
2.
0.
4.
0.
*** Vector rhs returned by MatZeroRowsColumns
Vec Object: 1 MPI process
  type: seq
0.
-0.13
-0.26
6.
-0.52
9.