[petsc-dev] GMRES and eigen estimates

[Mark F. Adams]

Well, technically yes, but I'm guessing the there is a switch that detected happy breakdown or something ... don't know.

On Mar 30, 2012, at 11:31 AM, Jed Brown wrote:

> Min should also be 1, no?
> 
> On Mar 30, 2012 9:26 AM, "Mark F. Adams" <mark.adams at columbia.edu> wrote:
> I've had problems with GMRES and eigen estimates in the past but I now have a smoking gun.  It seems that if you give GMRES an operator preconditioned with LU (ie, the preconditioned operator is the identity) GMRES gives me a highest eigen estimate of ~10 (way off).  With CG I get a prefect max=1.0, min=0.0.
> 
> Any thoughts?
> 
> Mark

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20120330/43578606/attachment.html>