iter =   0, Function value 1.05503, Residual: 0.0225435 
iter =   1, Function value 0.391065, Residual: 0.0360531 
iter =   2, Function value 0.114254, Residual: 0.0366085 
iter =   3, Function value 5.78927e-29, Residual: < 1.0e-11 
-------- result x, residual f=A*x-b, and Jacobian=A. -------- 
Vec Object: 1 MPI process
  type: seq
0.261434
-0.458727
0.8
-0.0834167
0.356001
Vec Object: 1 MPI process
  type: seq
5.82867e-15
2.96985e-15
3.88578e-15
Mat Object: 1 MPI process
  type: seqdense
0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 
0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 
0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 
Mat Object: 1 MPI process
  type: seqdense
-1.0000000000000000e+00 1.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 
0.0000000000000000e+00 -1.0000000000000000e+00 1.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 
0.0000000000000000e+00 0.0000000000000000e+00 -1.0000000000000000e+00 1.0000000000000000e+00 0.0000000000000000e+00 
0.0000000000000000e+00 0.0000000000000000e+00 0.0000000000000000e+00 -1.0000000000000000e+00 1.0000000000000000e+00