On Apr 28, 2014, at 3:23 PM, Xiangdong <epsco...@gmail.com> wrote:
> Hello everyone,
>
> When I run snes program,
^^^^ what 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)
Please send the full output where you see this.
> and also differ from norm of the Jacobian. What is the definition of this
> "SNES Function Norm”?
The SNES Function Norm as printed by PETSc is suppose to the 2-norm of F(x)
- b (where b is usually zero) and this is also the same thing as the “residue
norm”
Barry
>
> Thank you.
>
> Best,
> Xiangdong
