On Sun, Oct 30, 2011 at 3:57 PM, behzad baghapour < behzad.baghapour at gmail.com> wrote:
> So, this means there is no clear way to obtain Induced Norm of matrix like > NORM-2 ( unless using SVD and maximum SV ) ? I say yes. I invite you to examine the literature. Matt > On Sun, Oct 30, 2011 at 7:22 PM, Matthew Knepley <knepley at gmail.com>wrote: > >> On Sun, Oct 30, 2011 at 3:50 PM, behzad baghapour < >> behzad.baghapour at gmail.com> wrote: >> >>> OK. Thanks. >> >> >> More commentary: There are lots of papers about estimating these norms >> (1-norms too), and >> nothing works well. There are no good ways to generically approximate the >> matrix norm. For >> certain very special classes of matrix, you can do it, but these are also >> the matrices for which >> you have a specialize very fast solver, like the Laplacian, so you rarely >> care. >> >> Matt >> >> >>> On Sun, Oct 30, 2011 at 7:17 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote: >>> >>>> On Sun, Oct 30, 2011 at 09:43, behzad baghapour < >>>> behzad.baghapour at gmail.com> wrote: >>>> >>>>> Is there any way in Petsc to obtain Induced norm of matrix? ( >>>>> especially NORM-2 ) >>>>> >>>> >>>> Estimate the largest singular value using a Krylov method. >>>> >>> >>> >>> >>> -- >>> ================================== >>> Behzad Baghapour >>> Ph.D. Candidate, Mechecanical Engineering >>> University of Tehran, Tehran, Iran >>> https://sites.google.com/site/behzadbaghapour >>> Fax: 0098-21-88020741 >>> ================================== >>> >>> >> >> >> -- >> 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 > ================================== > > -- 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111030/117d42df/attachment-0001.htm>
