[petsc-users] snes true and preconditioned residuals for left npc

[Xiangdong]

Hello everyone,

I am using snes_type aspin, which is actually newtonls + npc (nasm). After
each newton iteration, if I call SNESGetFunction, the preconditioned
residual is obtained. However, if I use SNESComputeFunction, I get the
 true (unpreconditioned) residual.

If I want to know the preconditioned residual at a point different from
current solution, which function should I call?

Thanks.

Best,
Xiangdong
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