1atol=1e-50, rtol=1e-08, stol=1e-08, maxit=50, maxf=10000
2 0 SNES Function norm 5.41468
3 1 SNES Function norm 0.295258
4 2 SNES Function norm 0.000450229
5 3 SNES Function norm 1.38967e-09
6Number of SNES iterations = 3
7Norm of error 1.49752e-10 Iterations 3
8