[Trilinos-Users] condition number of an Epetra_FECrsMatrix

Hoemmen, Mark mhoemme at sandia.gov
Wed Apr 17 13:58:12 MDT 2013

Hi Nate!

On Apr 17, 2013, at 12:00 PM, Nate Roberts <nate at nateroberts.com> wrote:
> I'd really like to be able to get high-fidelity condition numbers for this matrix without going to MATLAB.  I don't mind if it takes some computational effort?I'm not using the condition number during my real solves, but studying the effect of various parameters (e.g. choice of basis functions) on conditioning.

You might also want to look at Belos' LSQR implementation.  It computes a monotonically nondecreasing lower bound on the condition number.  David Day has more details on this use case --


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