[petsc-users] KSPBuildResidual in ex42.c

[Jed Brown]

On Tue, May 22, 2012 at 6:10 AM, Klaij, Christiaan <C.Klaij at marin.nl> wrote:

> In src/ksp/ksp/examples/tutorials/ex42.c.html the Stokes system
> is solved and KSPBuildResidual is used to compute the residuals
> for the velocity components and pressure individually. Are these
> the preconditioned residuals or the true residuals?


The true residual.


> And how to
> get both?
>

Precondition it.

Note that if you only want norms, GMRES will compute one (preconditioned by
default).
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