[petsc-users] questions about the SNES Function Norm

[Xiangdong]

Hello everyone,

When I run snes program, it outputs "SNES Function norm 1.23456789e+10". It
seems that this norm is different from residue norm (even if solving
F(x)=0) and also differ from norm of the Jacobian. What is the definition
of this "SNES Function Norm"?

Thank you.

Best,
Xiangdong
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