[petsc-users] about Singular value

[behzad baghapour]

Then it would be an approximation to the Preconditioned Matrix (JM^(-1) or
M^(-1)J) up to the dimension of the Krylov subspace?


On Sun, Oct 30, 2011 at 2:47 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Sun, Oct 30, 2011 at 7:49 AM, behzad baghapour <
> behzad.baghapour at gmail.com> wrote:
>
>> Dear all,
>>
>> What is the procedure or method to calculate Extreme Singular Values when
>> calling KSPComputeExtremeSingularValues( )?
>>
>
> Are you asking what is done internally? We call LAPACK SVD on the
> Hermitian matrix made by the Krylov method.
>
>    Matt
>
>
>> Thanks, B. B.
>>
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>



-- 
==================================
Behzad Baghapour
Ph.D. Candidate, Mechecanical Engineering
University of Tehran, Tehran, Iran
https://sites.google.com/site/behzadbaghapour
Fax: 0098-21-88020741
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