Mark Adams <mfad...@lbl.gov> writes: >> Yikes! I did not check that. Why do we have PRECONDITIONED as the default >> for CG?
That is the preconditioned norm of the residual. I.e.,
|| M^{-1} (A x - b) ||_2
> The two norm of the residual (ie, natural, right?) is not monotone either
> in CG.
"natural" is CG's energy norm, i.e.,
|| e ||_{M^{-1/2} A M^{-T/2}}
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