Petsc And Slepc, singular system

[Umut Tabak]

On Tue, Jul 21, 2009 at 03:56:11PM -0500, Matthew Knepley wrote:
> If your system is badly scaled, roundoff errors could result in a pivot
> larger than our tolerance. It is also possible that your preconditioner
> resulted in a badly scaled system.
> 
>    Matt
> 
Hi,
    Thanks for the fast reply. 
    since the system is singular condition number will be bad any way,
    but I was wondering if there were already ways to overcome this
    problem. And are there ways to prevent the preconditioner to give a
    badly scaled system, what I mean is that the system is singular so
    will preconditioning improve that? I definitely read about these.

    Thanks and best,
    Umut

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