[petsc-users] KSPNormType natural

[Jed Brown]

"Kong, Fande" <fande.kong at inl.gov> writes:

> Hi All,
>
> What is the definition of KSPNormType natural? It is easy to understand
> none, preconditioned, and unpreconditioned, but not natural.

It is the energy norm.  It only makes sense for an SPD operator and SPD
preconditioner.

  ||x||_{P^{-1/2} A P^{-T/2}}

though of course it is not computed this way.
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